Question: what is alum called in english?
Answer: alum in British English (ˈæləm ) 1. Also called: potash alum. a colourless soluble hydrated double sulphate of aluminium and potassium used in the manufacture of mordants and pigments, in dressing leather and sizing paper, and in medicine as a styptic and astringent. Formula: K2SO4.Al2(SO4)3.24 H2 O.