archil

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archil

(är`kĭl, –chĭl) or

orchil

(ôr`–), blue, red, or purple dye extracted from several species of lichenlichen
, usually slow-growing organism of simple structure, composed of fungi (see Fungi) and photosynthetic green algae or cyanobacteria living together in a symbiotic relationship and resulting in a structure that resembles neither constituent.
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, 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).