I tried food coloring once...never dried, stayed sticky for a year before i pitched the blanks. In fairness, the food coloring was at least several years old so that may have had an impact. I've recently taken to experimenting with Artisan Dyes from Craft Supplies--alcohol based, fast drying. I really am finding those to be easy to work with. Each color is about $4 for 1.7 fluid ounces, and easy to work with.