alizarin definition

  • noun:
    • An orange-red crystalline element, C14H6O2(OH)2, found in making dyes.
    • a form of red or crimson dye
    • A coloring principle, C14H6O2(OH)2, found in madder, and today produced artificially as an an orange-red crystalline mixture from anthracene. Its used in making red pigments (for instance the Turkish reds), and in dyeing.
    • A peculiar red coloring matter (C14H8O4) formerly received from madder, and extensively made use of as a dyestuff.
    • Commercial alizarin comes in the shape of a yellow paste containing 20 per cent. of dried out material, and, less usually, as a dry powder. The dry compound when you look at the paste is rarely pure alizarin, but includes differing levels of flavopurpurin and anthrapurpurin, each of which may have properties similar to alizarin. Natural alizarin derived from madder contains purpurin aside from the overhead. The nature of the various commercial alizarins is normally designated by suffixed letters or figures. Therefore alizarin I, alizarin P, and alizarin V tend to be almost pure alizarin and give blnish reds, while alizarin CA, alizarin G, etc., contain anthrapurpurin or flavopurpurin, or both, and present yellow reds.
    • an orange-red crystalline chemical used in making purple pigments plus in dyeing

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