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archil
(redirected from orcein)

   Also found in: Dictionary/thesaurus, Medical, Wikipedia 0.01 sec.
archil (är`kĭl, –chĭl) or orchil (ôr`–), blue, red, or purple dye extracted from several species of lichen lichen , 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).


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For this study, 3 new histologic sections (6 [micro]m thick) were obtained from each slide and stained with hematoxylin-eosin, Masson trichrome, or orcein (for demonstration of elastic fibers).
The onion root tips were fixed and lactic-acetic orcein squashes on microscope slides were made for cytogenetic study.
 
 
 
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