E182 — пищевая добавка, краситель орсейл, орсин, Orcein, Orchil (Е182)

Orcein is approved as a food dye. Its chemical formula is C28H24N2O7. It forms dark brown crystals. Orcinol is extracted from archil lichen, Roccella tinctoria. It is then converted to orcein by ammonia and air. If the conversion is carried out in the presence of K2CO3, Ca(OH)2 and CaSO4, the result is litmus, a more complex molecule.

 
 

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