a white water-soluble crystalline substance with a bitter taste that forms addition compounds with metal ions and is used in photographic fixing, rubber vulcanization, and the manufacture of synthetic resins, white, lustrous crystals; bitter taste; ... b.p. sublimes in vacuo at 150-160°C; soluble in cold water, ammonium thiocyanate solution, and alcohol; nearly insoluble in ether ... Uses: Photography and photocopying papers; organic synthesis (intermediates, dyes, drugs, hair preparations); rubber accelerator; analytical reagent; amino resins; mold inhibitor.