French purple
English
Noun
French purple (usually uncountable, plural French purples)
- A dyestuff obtained from certain lichen known as orchella weeds, used for colouring woollen and silken fabrics, without the aid of mordants.[1]
See also
- orcein (archil, orchil, lacmus)
- archil lichen (Roccella tinctoria)
- orcinol
References
- 1839, Andrew Ure, A Dictionary of Arts, Manufactures, and Mines