So a large block of white clay is much cheaper than the colored stuff.. cause bubbling and/or plaquing when baking, and the color also won't be. Donna Kato also sells concentrated solid colorants for polymer clay on her .
Even if you've been baking in your oven for years without a problem, that doesn't. .. I do know for a fact that you can color polymer clay with Ranger and Pinata .
As long as your oven temperature is correct and your pieces are protected with a tent, you can bake for virtually as long as you like. Many polymer clayers like to .