Question

A biological stain obtained from a lichen rocella tin ctoria

Answer 1

Answer:

Two purple and red dyes, orchil and cudbear, were obtained from thelichens Roccella and Ochrolechia.Lichen dyes were dissolved in human urine, and the yarns were immersed in this mixture. ... The purple-red stainorcein is derived from the lichen Roccella tinctoria.

Answer 2

Answer:

Orcein definitions

(chemistry) A dye, related to litmus, that is extracted from the lichen Rocella tinctoria; used as a microscopic stain and as a food colouring.