I had the same frustration as you for many years. Why can't the companies
who make school art products give us materials that "work" in color theory?
My recent pet peeve is Binney-Smith changing the color names and formulas in
the box of 24 Crayola crayons - there used to be a perfect 18 color color
wheel in that box and the little kids just loved seeing how it developed!
When they started changing it, I had all my second and third graders call
the 1-800 number on the back of the box and complain. Why can't they
produce a "school" box of 24 with the true color wheel colors as well as the
new "fun" varieties? Anyway, the way I solved the "purple problem" was to
switch from red to magenta, which is still a red, just a cool red. It makes
great purple and orange, although for best results, there should be a cyan
color rather than the ultramarine blue they generally give as blue. As
someone wrote earlier (I'm sorry, I didn't write down who), the turquoise
works pretty well. Wouldn't it be great if some company out there would
produce TRUE primaries and TRUE complements, etc.????
They would certainly get my business! Does anybody out there have any pull?