Alizarin red S, Hi-Cert™, 25g - Himedia

Catalogue No.:                                GRM136

CAS No.:                                         130-22-3

C.I.No.:                                            58005

Molecular Formula:                         C14 H7NaO7S

Molecular Weight:                           342.26

Synonym:                                        Sodium alizarinsulphonate, Hi-Cert™

Appearance:                                   Yellow-green to dark-red powder

Solubility:                                        10 ppm solution in 0.1M NaOH yields clear solution

Visual pH Transition:                      pH 4.3 (light-yellow) to pH 6.3 (pink) to pH 12.0 (violet)  

Absorption maximum 1:                 554 - 558 nm (10 ppm in 0.1M NaOH)

Absorption maximum 2:                 590 - 599 nm (10 ppm in 0.1M NaOH)

Loss on drying (at 110°C, 2 hr):    <= 10.0%