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countable and uncountable, plural alizarins
(organic chemistry) A red substance, 1,2-dihydroxyanthraquinone, extracted from madder root and used as a dye. quotations examples
glass headed pins,oil-golds and copper greens,anthracite blues, alizarins,
1946, Elizabeth Bishop, “Roosters”, in North and South
In 1883, the German output of alizarin, the brilliant red chemical that imitated natural carmine, reached twelve thousand tons, dwarfing the amount being produced by Perkin's factory in London.
2010, Siddhartha Mukherjee, The Emperor of all Maladies, Fourth Estate, published 2011, page 82