archil

archil (ärˈkĭl, –chĭl) [key] or orchil ôrˈ–, blue, red, or purple dye extracted from several species of lichen, also called orchella weeds, found in various parts of the world. Commercial archil is either a powder (called cudbear), a pasty mass (called archil), or a drier paste (called persis).

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