Orcein (Orcein, archil, orchil, lacmus, litmus, orcein, orsin, litmus, E182) — obscure brunnea crystalla. Colorem mutant rubeum in ambitu acidico et caeruleo in alcalino. Formulae chemica C28H24N2O7.
ELOGIUM excluduntur est a album of "cibum additives pro cibo productionem« in sanitate et epidemiological normas regulasque (SanPiN 2.3.2.2364-08) in MMVIII.