Roccella tinctoria

Alkal. azoxv elaiomycin Streptomyces hepaticus, Actincm., Bact. from Ontario MI) (ycein-class wcein, constituent of litmus dye (Roccella tinctoria DC. (1805), Lecanora tartarea (L.) Ach., lichens from Scandinavian tundra, and also lichens from temperate and trc ical land MI). 

Various kinds of lichens, for example Lecanora tinctoria and Roccella tinctoria, possess the property of giving violet or blue dyestuffs when submitted to the joint action of ammonia and air. 

Flavonoid glycoside-quercetin-3-O-p-d galactopyranoside Roccella tinctoria Orcein... 

Derivatives of Orcein, which is a phenoxazine dye that can be isolated from the lichen Roccella tinctoria, accelerate fibril formation of the amyloid-beta peptide. These compounds deplete oligomeric and protofibrillar forms of the peptide [244],... 

Apart from textile dyeing, Tyrian purple gained early importance also in book illustration. Purple, as well as cheaper colours, were used, for instance Litmus (an extract from several lichens, especially Roccella tinctoria), in order to ground parchment sheets before they were artfully sketched and painted (Fig. 2.15). 

Occurs in Lecanora spp., Roccella tinctoria, Lepraria latebrarum, Lecidea aglaeotara, Pannaria languinosa and other lichens. Cryst. (pet. ether). Mp 131-132°. [a]u -h 17.4° (EtOH). 

Orchil (archil) Pourpre frangaise Complex mix of phenoxazones 1300 Cl natural red 28 Florentine trading family in the Levant Lichens (Roccella tinctoria and other species) + prolonged exposure to air and ammonia... 

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