Orcein (Orcein, archil, orchil, lacmus, litmus, orcein, orsin, litmus, E182) - nā aniani ʻeleʻele eleele. Hoʻololi lākou i ke kala i ka ʻulaʻula i kahi wahi acidic a me ka polū i kahi alkaline. Hoʻohui kemikala C28H24N2O7.
Ua kāpae ʻia ka mea hoʻohui mai ka papa inoa o nā "Mea hoʻohui meaʻai no ka hana ʻana i ka meaʻai" i ke Kānāwai a me nā kānāwai Sanitary a me Epidemiological (SanPiN 2.3.2.2364-08) i ka makahiki 2008.