nOrcin(Chem) A colorless crystalline substance, C6H3.CH3.(OH)2, which is obtained from certain lichens (RoccellaLecanora, etc.), also from extract of aloes, and artificially from certain derivatives of toluene. It changes readily into orcein.
Century Dictionary and Cyclopedia
norcinA peculiar coloring matter, represented by the formula C7H6(OH2), obtained from the orchella-weed and other lichens. It crystallizes in colorless prisms, and its taste is sweet and nauseous. When dissolved in ammonia it gradually acquires a deep blood-red color, and there is formed on exposure to air a new substance called orcein, which contains nitrogen as an essential element, and may be a mixture of several different compounds. On the addition of acetic acid orcein is precipitated as a brownish red powder. Also called orcinol.