purpurin(redirected from alizarin purpurin)
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1. Synonym(s): uroerythrin
2. A violet stain related to alizarin by addition of a 4-OH group to alizarin; found in madder root and other members of the Rubiaceae; used to detect calcium salts, boron, and as a histologic stain. Synonym(s): alizarin purpurin
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