Gypsum

Gypsum is a chemical that is obtained by searching cupboards during the Miss Cheevers part of the Recruitment Drive quest. It should be used on the empty tin to create the tin (gypsum). The tin can then be used to create a plaster cast of the bronze key needed to complete the challenge. If used incorrectly with the other ingredients, it may create one of the ??? mixtures, or create the strange tin.