Laccaic acid

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Description

A red dyestuff that is the primary colorant in lac dye. Laccaic acid is an oxy-anthracinone carbon acid. It is extracted from the raw sticklac during the shellac purification process using a dilute solution of sodium carbonate.

Synonyms and Related Terms

lac dye; Natural Red 25; CI 75450

Other Properties

Laccaic acid is soluble in methanol (dries to form needle-like crystals).

Composition C20H14O10

Sources Checked for Data in Record

  • The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 5342
  • Thomas B. Brill, Light Its Interaction with Art and Antiquities, Plenum Press, New York City, 1980
  • The Dictionary of Art, Grove's Dictionaries Inc., New York, 1996 Comment: 'Pigments'
  • Judith Hofenk-de Graaff, Natural Dyestuffs: Origin, Chemical Constitution, Identification, Central Research Laboratory for Objects of Art and Science, Amsterdam, 1969

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