We do the cold porcelain mass:
1. In the Teflon pot, add the vinyl glue, then the cornstarch, mix everything well, making sure there are no lumps.
2. We then add the stearin (we mix well again) and the formaldehyde (we mix everything well again).
3. Now is the time for the petroleum jelly (again, we mix) and the glycerin.
4. Mix everything well, eliminating any lumps that have remained and cook for about 20 or 30 minutes, always stirring.
Once we have obtained the desired consistency (imagine you are making bread dough, the consistency should be more or less the same), let's start kneading with your hands. It will be a bit hot at first, but as it cools down, we can ask our 'lab' assistants for help. It is also time to ink with white (if we have not added the white extract with the cornstarch).
Do you remember the hand cream that was between the ingredients? Its usefulness is to prevent it from sticking to our hands. If it hits us because of the humidity of the environment, perhaps we should use a little cornstarch, instead of the hand cream (we can make a sachet filled with cornstarch to sprinkle on the work table, to prevent the dough from sticking).
More information - Modeling cold porcelain 1
Source - cold porcelain step by step