I HAVE READ ALOT BOUT COLORING THE TOYS, AND I AM WANTING TO USE REGULAR FOOD COLORING, BUT HOW DO I MIX IT, AND I READ THAT SOME PEOPLE PUT A LITTLE VINEGAR IN IT, HELP, I'M STUCK, I DONT KNOW HOW TO MIX TO GET GOOD COLORS, AND HOW LONG SHOULD I LEAVE THEM IN THE MIX?

OOPs, I just started a new thread on this topic.
Anyway, here's the answer for me!
It is cake icing coloring, in walmart's craft department, with the wedding decorations stuff.

I have also heard that kool-ade is a good one too.