Gypsum

The RuneScape Wiki also has an article on: rsw:Gypsum

Gypsum
Released							27 June 2005 (Update)
Members							Yes
Quest item							Recruitment Drive
Properties
Tradeable							No
Equipable							No
Stackable							No
Destroy							Drop
Examine							A vial of something labelled 'Gypsum'.
Values
Value							1 coin
Alchemy							Not alchemisable
Weight							0.056 kg
Advanced data
Item ID							5579

Gypsum? (edit)? (edit)File:Gypsum.png27 June 2005 (Update)? (edit)YesRecruitment DriveNo? (edit)? (edit)NoNoNo? (edit)DropA vial of something labelled 'Gypsum'.11 coin? (edit)Not alchemisableNot alchemisable? (edit)0.0560.056 kg? (edit)Gypsum0Not soldinfobox-cell-hidden-? (edit)-No data to display55795579? (edit)? (edit)? (edit)

Gypsum is a chemical that is obtained by searching cupboards during the Miss Cheevers part of the Recruitment Drive quest. It is used on a vial of liquid to create an imprint of the key needed to pass the challenge room.