If you use a toned canvas, why not mix the paint you are using on the same color surface that you are painting on? See what your color will look like before you apply it to your masterpiece. Acid free, smooth mixing surface, paper is a neutral gray. The inside cover has a color wheel and gray scale information plus comments and suggestions by professional water media painter Stephen Quiller. Available in 3 different sizes with 30 or 50 sheets.