Laccainic acids

The laccainic acids are anthraquinone derivatives and the coloring components of the red dye Lac Dye , which is obtained from the lacquer scale insects . The mixture of laccainic acids AE is also known as CI Natural Red 25 (natural red 25).

Chemical structures

The laccainic acids are a group of five anthraquinone dyes that are contained in the insect dye Lac Dye. In addition to the main component laccainic acid A , these include laccainic acids B – E:

Laccainic acids
Surname	Laccainic Acid A.	Laccainic acid B	Laccainic acid C	Laccainic acid D	Laccainic acid E.
Structural formula
Molecular formula	C 26 H 19 NO 12	C 24 H 16 O 12	C 25 H 17 NO 13	C 16 H 10 O 7	C 24 H 17 NO 11
Molar mass	537.44 g mol −1	496.38 g mol −1	539.41 g mol −1	314.25 g mol −1	495.40 g mol −1
CAS number	15979-35-8	17249-00-2	23241-56-7	18499-84-8	14597-16-1
	60687-93-6 (mixture of laccainic acid A – E)
Wikidata	Q27162387	Q27162389	Q27162390	Q27162392	-
	Q60982962 (mixture of laccainic acid A – E)

Occurrence and use

Paint scale insects

Like carminic acid or kermess acid, laccainic acids are insect pigments obtained from scale insects. They are the colored components of Lac Dye.

→ Main article : dye varnish

Individual evidence

1. ^ Lac Dye. materialarchiv.ch, accessed on December 10, 2018 . 
2. ↑ Entry on laccainic acid. In: Römpp Online . Georg Thieme Verlag, accessed on March 5, 2019.
3. ↑ Mark C. Whiting: The dyes in early oriental carpets . In: Society of German Chemists (ed.): Chemistry in our time . 15th year, no. 6 . Verlag Chemie GmbH, Weinheim 1981, p. 179-189 .
4. ↑ Perey Brigl: The chemical research into natural dyes . Springer Fachmedien, Wiesbaden 1921, ISBN 978-3-663-03907-5 , p. 43 ff . ( limited preview in Google Book search). doi : 10.1007 / 978-3-663-05096-4