The plaster can now be mixed and poured over the face, going back to the ears and including part of the throat. The consistency should be such that it will not slide off yet still be able to pick up all the details of the face. Once set, the mold can be removed from the face. If time is short the cast can be made right away using zinc stearate or green soap as a parting agent. The back of the head can be done in the same way to provide a full bust.
Most paints come ready to use.
Some, like tempera poster paint, contain pigment and binder and need only water added. We also have the option of mixing pigment with glue and water. Hide glue or white glue may be used. If pigments have to be mixed to achieve the colour you want, do this dry. Take care not to contaminate the powders in the containers when dipping.