Modern method - the mother mould

Mother mould
Mother mouldMother mould

Plaster of Paris was applied over the silicon mould to form a hard outer casing or 'mother mould'. The plaster was made stronger by the addition of strips of cloth.

The middle picture shows the Berlin cast with half of the 'mother mould' in place. The other half of the 'mother mould' was made in the same way.

The two halves were separated by a very thin layer of clay. Transparent plastic sheeting was used to protect the cast from any splashes of plaster.