Metachromasia(redirected from Metachromasy)
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in biology, the property of cells and tissues that causes them to take on a color that differs from that of a dye. For example, in staining with thiazine dyes, the basic matter of connective tissue, tumor cells, and certain other cells are stained not blue or violet, the color of the dye, but red or pink. It is thought that metachromasia is caused by the polymerization of the dye molecules under the influence of free negative charges in the tissue.