Description: Alkali modifier, colorless translucent crystals or white powder, strong ammonia odor; decomposes in air; chemical is a mixture of ammonium bicarbonate and ammonium carbamate; known to Medieval dyers.
Dye Use: Neutralizer that can be easily removed by boiling; washes and defats (cleans oils out of) wool; cleans feathers, mordants. Incompatible with alum, acids, iron, zinc.