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