Orcein (Orcein, archil, orchil, lacmus, litmus, orcein, orsin, litmus, E182) - lu'ulu'u masu launin ruwan kasa. Suna canza launi zuwa ja a cikin yanayin acidic da shuɗi a cikin alkaline. Tsarin sinadarai C28H24N2O7.
Excludarin ba a cire shi daga cikin jerin “abubuwan da ake sakawa na abinci don samar da abinci” ga Dokokin Tsarukan Tsarkakewa da Cututtuka (SanPiN 2.3.2.2364-08) a shekarar 2008.