Common Name: Purpurin
Suggested Name: Purpurin
Other Names:
Alizarin purpurin
C.I. Number: 58205 & 75410
C.I. Name: Natural red 8 & 16
Color: Yellow (aqueous) Red (ethanol)
Solubility Aqueous: Soluble at boiling
Solubility Ethanol: Soluble at boiling
Absorption Maximum: 486, 521 (Conn) 456 alcohol (Conn) 485, 521 (Aldrich)
Empirical Formula: C14H8O5
Formula Weight: 256.2
Description
Purpurin is a natural dye and, along with alizarin is found in madder root (Rubia tinctorum L.), although it appears to form during storage. It is very similar to alizarin red S, and is used for much the same purpose as it also forms bright red lakes with calcium.
References
- R. D. Lillie.
Conn’s Biological Stains
Williams & Wilkins, Baltimore, MD., U.S.A. - Aldrich chemical catalogue, 1992
Aldrich Chemical Company, Milwaukee, WI, USA. - Susan Budavari, Editor,
The Merck Index, Ed. 12
Merck & Co., Inc., Whitehouse Station, NJ, USA
