Introduction to Casein, a Milk Paint | Sandrine Curtiss | Skillshare

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Introduction to Casein, a Milk Paint

teacher avatar Sandrine Curtiss, Artist, explorer.

Watch this class and thousands more

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Taught by industry leaders & working professionals
Topics include illustration, design, photography, and more

Watch this class and thousands more

Get unlimited access to every class
Taught by industry leaders & working professionals
Topics include illustration, design, photography, and more

Lessons in This Class

    • 1.

      Introduction

      1:13

    • 2.

      History

      2:41

    • 3.

      Properties

      3:18

    • 4.

      Supplies

      5:01

    • 5.

      How To Mix Casein

      6:22

    • 6.

      First Layer

      5:17

    • 7.

      Second Layer

      10:47

    • 8.

      Details

      14:10

    • 9.

      Final Thoughts

      0:56

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About This Class

If you've never heard of casein paint before, don't fret, you're not alone. Although this medium is older than oils, it's fallen under most artists' radars for quite a while.
Casein is a medium similar to gouache; not quite like watercolor and not quite like acrylic. 
Join me in this all level class to learn more about it, how to use it, and work on a simple monochromatic painting from start to finish.
We will have an easy start with just a couple of tubes, a few brushes, and some watercolor or mixed-media paper.
If you don't have casein amongst your supplies, you certainly can follow the step-by-step with gouache, acrylic gouache, or even acrylic paint.

If you're interested in taking this class and are not a Skillshare member yet, I'm happy to share with you my referral link, which will give you a free two months subscription. You will not only be able to take my class, but also thousands of other classes offered here. Have fun!
Click here to sign up.

Meet Your Teacher

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Sandrine Curtiss

Artist, explorer.

Teacher


Hello, I'm Sandrine.

I'm a self-taught artist, always eager to explore new mediums and new techniques. As I learn more and more, I like to share my findings with other artists as a way to give back.
Until now I've shared my art on YouTube, Instagram, and Facebook, and I'm happy to be able to do it in a bit more details here, on Skillshare.
I invite you on an art journey where we'll explore all sorts of media, both well and not so well known. So pack a bottle of creative juice, and come along with me.

See full profile

Related Skills

Art & Illustration Painting
Level: All Levels

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Transcripts

1. Introduction: Hi, my name is Sandra and Curtis. I love exploring new mediums, where they come from and how to use them. In this time, I found a very obscure one, yet used by men for as long as we can date the origin of painting. In this class, you will learn about one of the oldest medium known to man, casein. We will talk about its history, its properties, and the supplies you will need to get started with our project. I will show you how to mix the paint, how to apply the first layer. All the steps necessary to complete your project. And by the time the class is over, you will have a finished monochromatic painting of a shiny spoon. Once the class is over, I invite you to share your painting with everyone and talk to you about your experience with this medium. If you liked it, will you keep using it? Really, anything you want to share? I hope you will have a lot of fun taking this class and I will see you then. 2. History: Casein has been a very versatile medium for very long time. It's a pain that's fast drying, durable and permanent, and it's made from milk. In fact, it's one of the most durable mediums known to man. They were cave paintings found in Asia dating from 9,000 years ago. And actually there's some that are still being found that are even older. It's been used through the centuries by ancient Egyptians, Byzantine, Roman, and run since artists. And it's been used for many different things like murals, frescoes, Fine Arts paintings and wall paint, decorative painting for furniture. And even during World War II, was used for camouflage, and in the 18th century was used to paint theatre sets. And it still is today. Because the recipe for casing paint is very easy to make. Artists have been just making it as they needed it. And since one of the main ingredient is milk, it can't really be kept for very long because it spoils. Now after the US Civil War, Paint cans started flooding the market, but knock paint couldn't be commercialized because of its short shelf-life. So you could only find oil-based paint in those cans. But in the early 20th century, there were new recipes that were developed which used synthetic rubber and styrene. And he gave birth to the first type of latex paint. And it was called Chem tone. And I was used mostly as we'll paint. So that was a huge success because unlike the oil-based paints, commercializing cans, it didn't contain lead. In the 130s case. Instead of being tubed, fine artists and illustrators didn't have to make their own paint anymore. So fine artists started using them more and they mostly use it as underpainting for their oils and even started using casein instead of oils. Because casein has washed capabilities of watercolor, it has this smooth opacity of gouache, the rich texture of oils and acrylic paints like wash. It was loved by illustrators because it dries fast and has a velvety matte finish, which makes the paintings easy to photograph. But like wash also, it started losing popularity when acrylic paint was made commercially available in the 1950s. So casein is one of the oldest mediums known, yet one of the least familiar today. Next we'll talk about casings properties. 3. Properties: Casein is a water-soluble medium, just like watercolor, gouache, and acrylic. And it shares many qualities with these mediums. And yet it stands out on its own paints all start with the same ingredients. The pigments were the different types of paints. Very is how small the pigments are ground and what binders is used to hold those pigments together, for instance, watercolor and gouache. They often have gum Arabic, or honey as a binder, yet watercolors usually transparent and gouache is opaque. So the main difference between the two is that watercolor uses fine or pigments that dissolve and spread more on paper. And that's letting the paper show through. Gouache has larger pigments that cover the surface of the paper more and it's making the paint more opaque. The same goes with casein. However, with casein, the binder is the milk protein that gives its name to the paint casing is very similar to gouache. It's a bit thicker than gouache and it's opaque. But unlike gouache, when the paint is dry on the paper, It's not as easy to reactivate, especially if it's a thin layer of paint or if the paint has been dry for awhile. So it's a bit like acrylic two, which is also a water medium. Acrylic does not reactivate it all and dries shiny while casein in gouache, they have a matte finish when they're dry. Now what you need to know is that casein has a funny smell. Although I quite like it in a weird way. And some people either like it or don't. But as far as I know, it's not toxic. And also the paint is very light fast. So you paintings will last for very long time without fading away. Something else you need to know is that lighter color is dry a bit darker and darker colors dry a bit lighter. And that's because when the paint is mixed with water, it tends to make you change tones when the water evaporates and the paint dries, the real color reappears. It's the same with watercolor, gouache, and acrylic, but the colors shifts shows more with some mediums and others. So because casein tends to be a bit more like acrylic when it comes to reactivating it. It has a limited palette life. What I mean by that is that after a couple of days, it won't be as nice if you try to reactivate it on the palette. There will be some little pieces that are dry that won't melt anymore with the water. So don't make yourself a casing palette. Just use the paint fresh as much as you can. You can save it. You can keep it a couple of days. It'll be fine depending on the type of weather you have. But I wouldn't keep it longer than that on your palette. So that also means don't squeeze too much paint at a time. Only Squeeze what you'd need on your palette. The last thing you need to know is I casing can be varnished. And if you do so, it can actually make your paintings look more like oil paintings. And when it's done properly, the paintings can last a lot longer than oil paintings. Next, we'll be talking about the supplies you'll need for our project. I'll see you then. 4. Supplies: For our painting today will be using only two colors. The ivory black in the titanium white. Because when you're getting familiar with the new medium, it's easier to use just a few colors. It helps you focus more on the medium itself and its properties rather than trying to find out the right color for your painting. So black and white will give us a nice range of grays. And we'll be able to make a monochromatic painting with all the values we need. Now for the brushes, we need some synthetic brushes because the natural bristles don't work as well with casein, they're a bit too soft because casing is thicker than watercolor and in its bounds here, bristles to be able to be pushed around on the paper. I'm gonna be using a round six, a round three and around one. As well as the filbert for the round brushes are great because they have a pointy tip. So it's great to add details. And the filbert helps to add more paint and push it around. And it's nice because it has a rounded edge and it's just very versatile. For the paper. I'll be using a watercolor paper and it's 140 pounds. You can pick watercolor paper or mixed media paper. It doesn't really matter. The one I have here is a five by seven block. It's 100% cotton, it's cold press, and it's Fabriano artistically. It's 140 pounds, as I said earlier. I'm very picky when I use watercolor paper with my watercolors. But for gouache and casein, I find that any thick paper will work fine. So there's no need to buy an expensive watercolor paper. Just make sure that it's at least on 40 pounds because we're going to use it with water. So you don't want it to buckle. And I pick this one again just because I had it on hand. Now, because this is a block and all the pages are stuck together, it helps prevent the paper from buckling when you add water. But if you just using a loose sheet, you can just tape it down on either your desk or a drawing board so you can use washi tape or painter's tape. Also, I chose a five by seven format because I believe that when you try a new medium, it's easier and less frustrating to start small. Here again, the choice is yours. If you have a larger sheet of paper and you want to work larger, that's fine. It's up to you, but you can always cut it down to the size you want. Next, you'll need a cup of water or two. You can have one that you use to clean your brushes and another one that has clean water to add to your washes. But since we're gonna do a monochromatic painting, it's really not that necessary to have two of them, but it's up to you. And finally, you'll need a palette also. And I like to use this ceramic tile. I got it at my hardware store for $1 or two. I forgot. And I like, I like I like it very much because the you can see that I still have some paint on it. But I like it very much because the paint mixes very nicely on it. And also it's very easy to clean and it doesn't get stained. Here again, it's up to you can use anything for palette. You can use a paper plate if you want or your favorite palette. Whatever you have is fine. So that's about it for the supplies you will need for this painting. Of course, you need a graphite pencil or mechanical pencil to draw your little spoon before you paint it. And an eraser, if you make mistakes, if you're going to transfer the line drawing, you can use tracing paper or transfer paper. Let's thing that is not necessarily needed for your, the painting that we're gonna do today. That's extra stuff that pretty much everybody already has. Now if you're watching this class and don't have the case in yet. But she still wanted to start painting. You can always replace casing with gouache. If you have a black and white, It's not quite the same. But it's going to give you an idea. Although the gouache is easily reactivated when wet and casein is not. So you might find it easier with casein, but if you're familiar with gouache already, then you should know what to expect. Next. We're going to see how to apply the paint on the paper, how to mix it with water and to make your washes. I'll see you in the next video. 5. How To Mix Casein: Now I'm going to show you how to mix your paint and how you can actually use it. So I mentioned that you can dilute it with water easily and you can make nice washes. So you can do gradients with just water. If you add a lot of water, can even add more than this. You can get very thin that washes. And then the more pigments you add, the darker your washes will be. Eventually you just have barely know water. And just pure pigment or pure paint. It'll be nice and opaque. So when you use it like this is just like using watercolor. And you using the white of the paper to create the different values. But because the pigments are thicker than watercolor, they're not as fine as watercolors. It might not look very nice and clean as with watercolor washes. Now another way to work on your values is to just mix your color with white. Just like when you just add water. The more white to add, the lighter the value will be. But you can create washes that are opaque and not have to depend on the white of the paper to show through. So again, you just add more and more black to make darker and darker washes. And eventually you can just put black by itself. You can see the difference between the two. And I think that using the white makes for a cleaner gradient. Because if I'm using casein is because I want the opaque result rather than the wash. However, we will use this technique for the very first layer of our painting just to establish the values. Once that's done, we'll just add the more opaque colors. You can apply your paint right out of the tube without any water. But it's very, very thick. And if you don't put any water, It's a little hard to get fine details, but it's possible. You can even use a palette knife. Create impasto effects. However, you need to realize that when you do this, you paint is going to be pretty thick. Gouache. Once it's dry, if your paint is very thick, it's very prone to cracking. So you can still do it just not on paper. I'm not even on Canvas. You should be using a hard surface like a wood panel or something similar. Now for our painting, because it's not going to be very big and it does have some fine details. If you want the paint to flow nicely and smoothly, you're going to have to add them just the right amount of water for the paint to stay opaque, but to flow without any problem. Because when you use a very fine brush, if your paint is not diluted enough, you cannot create details. You want it to be creamy. Like I'm a little thicker than milk consistency but not much more. Maybe heavy cream. If there's not enough water, then it'll be more like dry brush and you will have hard time with the details. So play around with this, with the consistency of your mixes. Play it on paper, see how it works, see how much water you need to have the effects that you want. Once you familiar with the consistency of the paint and how much water you like to use, then you can move on to Step one of our project. Next, we'll be talking about the very first layer of our painting. 6. First Layer: Before we get started with your painting, transfer the line drawing of the spoon onto your watercolor paper. Can either sketch right onto your paper or use the line drawing that I've attached to the lesson and trace it or just trace the photo itself. And you can also use transfer paper to do the same thing. The choice is yours. I personally prefer to trace or transfer my sketches because I'm always afraid that if I sketch right onto my paper, if I make any mistakes and I erased too much, it might damage the surface of my watercolor paper. So that's why I like transferring my sketches better. Now for the next three lessons, I will suggest to watch each video once and then watch it again as you paint along. For instance, this lesson is about the first layer. So you can watch it through and then watch it again as you're painting and you'll be better prepared and you'll know ahead of time what you're supposed to do. For layer one. Our goal is to establish the values. It's always daunting to start a painting with the white of the paper or via Canvas. So this is what I like to do. I like to just cover it all with color or black and white or whatever color you've chosen. And then establish the values just gives me a first step. And once that's done, then I can work from there and add details. So we won't be paying much attention to the details for now. And we're going to use a lot of water to create a very light wash, just like we did in the previous lesson. We want to be able to see the paper shine through the paint. But this time we won't just mix the black casing with water. We'll mix it with white and then diluted with water. It will give us a nice diluted gray. And we need to remember that as we're building the values, we always need to keep an eye on the reference photo. For this part of the spoon. I started with the mid tones and then I used the white of the paper for the highlights. And then I painted the shadows. And I worked on the handle of the spoon the exact same way. So we can add more or less blacks were a mix, but it's important to try and keep the same amount of water. For the shadow of the spoon on the table. I worked wet on wet. So I use clean water to cover the whole surface of the shadow. And then I applied the paint and let it spread. I found that it was pretty easy to push the paint around on the paper while the wash is still wet. And I made sure that the points of contact of the spoon with the table look darker than the rest. That is the very end of the handle in the back of the spoon that's touching the table. And last before the wet on wet wash was dry with a clean, damp brush. I tried to feather it out making it bleed a bit outside my outline. And that's going to help me later on to give it a soft look once I add my more opaque paint. Next, we'll talk about how to apply the second thicker layer. 7. Second Layer: Once the first layer is completely dry, then we can move on to the second layer. We can keep our palette as it is. And in fact, we'll keep it as it is until the end of the painting will only be adding more of this water and pulling in more white or black as needed. So as you can see, we start mixing the paint exactly the same way as we did for the first layer, except that we put a lot less water. So we have a little pool of black and a little pool of white, and we just mix them together to prepare the mid tones. Then I made a mixture of not just black, because I think pure black would be way too dark, but I did add a little bit of gray in it. And I'm covering all the shadows in that part of the spoon. I need to be really careful not to go outside of the lines, so a smaller brush is necessary in this case. However, the paint is a bit thicker this time. So the filbert is helpful because I can paint a lot of details with it and still push the paint around even though it's a little thicker. Once again, I always keep my eyes on the reference photo and I always adjust the values as I go. As you may remember in the class about the properties, we talked about how the colors darken, enlightened once they're dry. As I add more layers in different places, I always go back to the previous application once it's dry or it's drying, and I adjust the value as I need it. Now, as you can see before the paint is dry, it's very easy to blend all the colors and the values together doesn't dry instantly. So you do have a little timeframe to adjust and blend and smooth out the surface as you wish. And because on the photo of the spoon and you can see that the shadows are not straight lines everywhere it was some places they are, but in most areas there there are blended. There's a gradient between the lights and the shadows and working with the casein before it dries really helps blending the paint. For the highlights. I use, basically pure white, which I blend on the edges. So for awhile they're not gonna be pure white because some gray is going to mix with it, but later on add more white to it. And it's going to pop out more. The good thing about casein, just like gouache, is that because it's opaque. If you make mistakes and you don't define your shadows and highlights, don't put them in the right place the first time around. It's no big deal. You can always go over it with another layer of paint. So it's a very forgiving medium for that. So at this point again, I'm basically adjusting my values, pulling the dark and the whites, trying to make them look as much like the picture as possible. And they're going for perfection, but I'm trying to be as accurate as I can. I'm working the exact same way on the handle. As I'm going down the handle, I'm adding all the different values that I see and I don't look at it as a spoon really. I look at it as blocks of colors or blocks of grades. There. If you struggle a little bit to add highlights like wider values, it's okay because you probably not waiting for the layer to dry. So just work on another area or weight or even use a hairdryer to make sure that your layer is all dry. And once it is, you can add your whites on top. And there will be a lot more opaque. They will not be mixing with the previous layer. With this painting. I was being a bit too impatient and I didn't really wait for the layers to dry. So I had to go over them several times because as I was mixing the whites or the lighter grays, they became dark. Not only because of the shift of values once it dries, but also because it was mixing with the other colors. I took a round brush to start adding a few details. And again, I'm not too worried of not being exact just yet. All I'm trying to do is not to go outside of the lines. But if my lines on straight and if it's not perfect, it's okay because once it's dry, I can go over it again and make corrections. So once you're happy with your values, opaque layers, make sure you let your painting dry. And then we'll be adding the final details. So next, we'll be talking about those final details. 8. Details: Now for the fun part, still working with the same palette and still making sure that our previous layer is totally dry. It's now time to work on the final value adjustments and adding the details. Now as you can see, I don't have a very steady hand. So painting a fine line like this is not very easy for me. However, I don't really mind. I'm not making something perfect. It's a painting. And as I mentioned before, casein is so forgiving that if mess up my lines, I can always correct it by adding another layer of paint over it. So that's really not a problem and there's no need to stress over it. So at this point and more than ever looking at the reference picture because I'm adding the details. So I saw that on the black line of the spoon, which is really an indent. Well, it's darker than the other areas because the light doesn't go in very much. However, right under that line, the light hits, there's a pretty sharp highlight, are going with pretty much pure white to make a very nice contrast. And you will see that that sharp contrast really helps to spoon looking more real. I messed up again with the white and I really wish I had a steadier hand, but again, this is no big deal. I can fix it adding more black so it's no problem. So since I started working on this part of the spoon, I'm just working by sections. I might go back later on, but I'm trying to just finish section at a time. So I added a few more highlights and shadows on the right section of the handle. For the middle of the handle, I noticed that there was also a sharper contrast than what I had before. So I added some darker grays and some highlights closer to that black line. So all it is really, is looking at the reference photo and looking at all those different blocks of grays and trying to define the shapes of those different blocks. And they keep in mind that my whites or my lighter highlights will darker and as they dry. So keep this in mind because once it's all dry, I'm might have to adjust that. Again. I might not because the the darks might lighten, but I will have to keep an eye on it once I'm done to make sure that I have the good contrast, something that I like is something that looks good. For a nice dramatic effect, I use pure white for the highlight on the handle. Now if you remember on the lesson about how to mix your paint, I talked about the quantity of water to use when you have to make fine details. And here we have a perfect example to create the indents on that spoon handle so that you don't drag the paint to that. It's easy to flow and nice and smooth on your paper. You get to make sure that you've got the perfect consistency. You can, if you want, if you still not very familiar with the paint, you can have a piece of scratch paper next to you. And as you mix your color, you can try it on the paper to see if using your fine brush with that mix will help you create a nice crisp line and flow nicely on your paper. At this point, I'm pretty happy with the handles, so I start working on the other part of the spoon and I decided to darken the shadows. I really want to give a nice sharp contrast. And so making the highlight slider and the shadow darker will give me that effect. In general, whether you draw with a graphite pencil or you paint. What helps you create a more realistic painting or drawing is a sharp contrast between your shadows and your lighter areas. If you mostly have mid tones, then your drawing or your paintings is going to look flat. If you have a nice contrast, then it will add depth to your work. So now it's time to work on the shadow and we're not going to leave it all light like it was before. We're going to make it opaque as well. So I started with a mid tone and looking at the reference photo, I noticed that some parts of it are lighter than others. So the left part of the shadow is more in the light if it makes sense. And so it's a little lighter than the right side of this shadow. And I'm talking about the shadow of the handle and also the points of contact of the spoon with the table. There are darker. Obviously. I have to make sure that my grades are darker there. And I do not cover the whole watered-down wash. If you remember, we left a little feathered area. So this will let it show because again, if you look at the reference photo there, there is a very light shadow like that. That's the reason why we did it at the first place, to let it show through. Once I'm happy with the shadow, I go back and add the final, final details to make sure that it looks as realistic as I can, I would just hit the lines also that we're not very straight or try to at least, and I tried to turn down a bit that very white shadow that I had on the edge of the spoon because it popped out a bit too much for my liking. So that's it. Once I'm pretty happy with the result, I just stopped because if I start overworking it, then it's going to mess it up. And here's our shiny spoon painted with casein. I hope I'll get to see yours very soon. Stick around for the very last lesson where we're going to sum up what we've just done. 9. Final Thoughts: I hope that you enjoyed learning about casein and that you had fun working on your project. Remember to share your progress as well as your final painting. And if you want to practice more, you can always find an easy subject that interests you and do a monochromatic painting of it. Now, please don't think that monochromatic only means black and white. You can pick any color you like. Some colors are more effective than others, but you can easily achieve beautiful results with a blue, for instance, even if blue is not the color view subject. So play around and experiment and have lots of fun. I personally be happy to see what else you do with your casing paint. So thank you very much for taking this class. I hope to see you soon in my next one. Have a wonderful day. Bye bye.