Before revision: Purple plague (sometimes known as purple death or Roberts-Austen's purple gold) is a brittle, bright-purple compound, AuAl2, or about 78.5% Au and 21.5% Al by mass.
After revision: William ChandlerPurple plague (sometimes known as purple death or Roberts-Austen's purple gold) is a brittle, bright-purple compound, AuAl2, or about 78.5% Au and 21.5% Al by mass.