Orcein

Product : Orcein
C.A.S. No. :1400-62-0

Specifications:

Solubility 0.1 %(0.1N NaOH) = Clear solution
Absorption Maximum (0.1N NaOH) ?max = 574-580nm
Absorptivity (A1%/1cm in 0.1N NaOH, at ?max) = 250-450
Loss on drying (110�°C) = <7%

Product Description:

Once used as a food colouring but now banned throughout the EC Cudbear is a dye extracted from orchil lichens that produces colour's in the purple range. It can be used to dye wool and silk, without the use of mordant. Cudbear was the first dye to be invented in modern times, and one of the few dyes to be credited to a named individual. Orcinol is extracted from archil lichen, Rocella tinctoria. It is then converted to orcein by ammonia and air. Orcein is a reddish-brown dye, orchil is a purple-blue dye. aminoorceinimines.