These color charts are not exactly "intuitive" :P but I still had lots of fun making them! and definitely worth all the hours of mixing cause now I know exactly what to mix to obtain a certain color :)
Below is the chart I made with Dr PH Martin Radiant WaterColors. They are extremely vibrant but some colors didn't mix as consistently as my tube colors.
This color chart was made with tube colors.(Camel artist's watercolors which is an Indian brand)