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The Columbia Encyclopedia, Sixth Edition.  2001-07.
 
archil
 
 
(är´kl, –chl) (KEY)  or orchil (ôr´–) (KEY) , 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).
 
 
The Columbia Encyclopedia, Sixth Edition. Copyright © 2007 Columbia University Press.

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