Treadstone
I took a color theory class & have an idea of what you are looking for. You want a formula or recipe guide for making particular colors. I hate to tell you but it's not likely you will find one. The varying intensity of pigments in different types & brands of paint makes this virtually impossible. You will get different results mixing watercolors vs. acrylics vs. oils vs. guache. And the pigment loads of brands differ. I suggest you create a basic color wheel or palette to get a feel for your paints. (tones, shades, colors) Use a pre-fabricated color wheel as your guide.

clowmy
Hi Cat, Go to an art supple store,they should carry them. Clowmy

OminousOnus
Try your local book or craft store, or visit Amazon or another online store, and look for any of the following books: Color Mixing Recipes - William F. Powell (Walter Foster published) Color Mixing Swatch Book - Michel Wilcox Color Mixing Recipes for Portraits - William F. Powell (Walter Foster published) These are $9.95 each.