Would the same mixing principles that apply to paint work for Food Coloring variations? If I wanted to create different shades using Food Coloring, is there a different method of mixing them or would the same principles apply as with paint.  Is there a standard mixing chart that details the different variations that would break down the process?
Yes, the principles are the same as for paint. It is subtractive color, meaning each new color you use subtracts out all of the colors except the ones it reflects. The other kind is additive color, when you are mixing lights like on a stage or out of a television set, and doesn't have much application to food that I can think of.