DERIVATION.--A solution hydrate is evaporated, and this is fused and run
into moulds.
PROPERTIES.--White, translucent pencils or fused masses, hard and
brittle, showing a crystalline fracture; odorless or having a faint odor
of lye and a very acid and caustic taste. Very deliquescent in air.
Soluble in water and alcohol.
Not used in this form to any extent.