First I put most of my colours into a book like this:

Then I did this big chart, looking for a grey I like (cobalt blue and black is fine, but maybe not the end of the journey).

My thoughts on this:

- yellow to red is what I expected

- there are lots of beautiful greens and browns

- the paint-pots were not always perfectly clean, so the results may be murkier then they could be

- to make this perfect it would be necessary to work with different amounts of the two mixed colours, and to look how they work with little or much water - this chart is a first idea of the mixed colours, not a mathematical certainty

- I miss pink, rose, lilac, purple, violett - maybe it is possible to get them with my paints, but it is obviously not easy. So I will go and buy some, because I like those colours very much…

…

Two days later I have bought some new colours (and an old favourite green) and made this:

The paper is a simple and thin scetching paper, it doesn‘t work well with water…

Yesterday I found another box of (low-budget) watercolours:

Not bad, I think. They are in those little pans that can be replaced, and I have hardly used it before. 

So for now there is really no need to buy more…