I would like to make this to repair a hole in the plastic lid of a kettle. The lid is black. If I use black food colouring, is the colouring likely to run once the plastic is hard?
Md Ariful Islam
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Dr. Md Rushad Rahman
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Casein plastics can only be molded when the milk/vinegar mixture is still hot, and this is when you should add food coloring to your plastic. Once the casein plastic has dried/hardened, the color should not run as the material readily takes a surface dye. Casein was often used to make buttons, and in this form it is resistant to washing. Hardening of your plastic may be more effective if immersed in a formaldehyde solution (instead of just air drying).
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