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A change in color caused by variation of the physical conditions to which a body is subjected, especially such a change caused by variation in temperature.

met′a·chro·mat′ic (-măt′ĭk) adj.


1. (Biology) (of tissues and cells stained for microscopical examination) taking a colour different from that of the dye solution
2. (Biology) (of dyes) capable of staining tissues or cells a colour different from that of the dye solution
3. (Biology) of or relating to metachromatism
References in periodicals archive ?
The special stains for amyloid are triphenyl methane dyes, methyl and cresyl violet for demonstration of metachromasia, PAS, the substantive cotton dyes Congo red, Scarlet red, Dylon and Cardinal red.
Periodic acid-Schiff, crystal violet, and Congo red stains were performed and the specimen did not show any amyloid deposits or metachromasia (Fig.
Histopathological diagnosis was made by observing mast cells showing metachromasia with toluidin blue in full-thickness skin biopsy (2).
Without any distinctive morphological characteristics, mast cells are identified due to their property of metachromasia in Blue toluidine staining.
Metachromasia is the property imparted to the cartilage tissue by glycosaminoglycan-rich proteoglycan such as aggrecan.
They were evaluated by the content of hexuronic acid (carbazole reaction) and the metachromasia produced by the glycosaminoglycans sulfated in the presence of 1.