Difference between revisions of "Laccaic acid"
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== Description == | == Description == | ||
| − | A red dyestuff that is the primary colorant in [ | + | 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 == | == Synonyms and Related Terms == | ||
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lac dye; Natural Red 25; CI 75450 | lac dye; Natural Red 25; CI 75450 | ||
| − | == | + | ==Physical and Chemical Properties== |
| − | Laccaic acid is soluble in methanol (dries to form needle-like crystals). | + | * Laccaic acid is soluble in methanol (dries to form needle-like crystals). |
| + | * Composition = C20H14O10 | ||
| − | + | ==Resources and Citations== | |
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* ''The Merck Index'', Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 5342 | * ''The Merck Index'', Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 5342 | ||
Latest revision as of 11:24, 6 October 2022
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
Physical and Chemical Properties
- Laccaic acid is soluble in methanol (dries to form needle-like crystals).
- Composition = C20H14O10
Resources and Citations
- 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