Chrysoine_resorcinol
Chrysoine resorcinol
Chemical compound
Chrysoine resorcinol is a synthetic azo dye which was formerly used as a food additive.[citation needed] In Europe, it was banned as a food additive in 1977.[1] In the US, it was banned in 1988.[2]
Chrysoine resorcinol can be used as a pH indicator with a color change between pH 11 and pH 12.7. In colorimetry, it has an absorption maximum of 387 nm.
Chrysoine resorcinol (pH indicator) | ||
below pH 11.0 | above pH 12.7 | |
11.0 | ⇌ | 12.7 |