Wow! When I started making these 12 color charts I thought it would take me a couple days. Instead, it took me a couple of weeks with each chart taking about two hours.
You may ask, "Was it worth it?" and I'd reply, "Yes, it was." I learned so much about this palette. Not only did I learn how the colors interact when mixed and how to consistently tint the colors. In addition, I learned that each color is different in its opacity where some colors are more transparent than others.
The true test of my efforts will come when I set out to put the pigments to use and how easily I'll be able to anticipate the mixture.