Ponceau S
Description
A cherry red biological stain. Ponceau S is a diazo type dyes composed of the tetra sodium salt of 2,7-naphthalenedisulfonic acid. It forms a weakly acidic solution in water that can stain proteins. It has also been used as a silk and wool dye and as a former food colorant for maraschino cherries.
Synonyms and Related Terms
CI 27195
Other Properties
Soluble in water. Maximum absorption wavelength = 520 nm.
| Composition | C22H16N4O13S4.4Na |
|---|---|
| CAS | 6226-79-5 |
| Molecular Weight | mol. wt. = 764.62 |
Hazards and Safety
Mallinckrodt Baker: MSDS
Additional Information
° R.Wolbers, G.Landry, "The Use of Direct Reactive Fluorescent Dyes for the Characterization of Binding Media in Cross Sectional Examinations" in Preprints of the AIC Meeting in Vancouver, 1987. ° M.Johnson, E.Packard, "Methods Used for Identification of Binding Media in Italian paintings of the 15th and 16th Centuries" Studies in Conservation, 16:145-164, 1971.
Authority
- The Merck Index, Susan Budavari (ed.), Merck Research Labs, Whitehouse Station, NJ, 12th Edition, 1996 Comment: entry 7750
- Aldrich Chemical Catalog