Indigo / reduced indigo / Indigo powder / pure indigo / milled synthetic indigo

English name：Indigo；2-(1,3-Dihydro-3-oxo-2H-indol-2-ylidene)-1,2-dihydro-3H-indol-3-one；2,2'-Bis(2,3-dihydro-3-oxoindolylidene); Indigo blue；C.I. 73000；Vat Blue 1

Other names: reduced indigo; Indian geology; Indigo powder; Indigo (1); Reducing blue 1 #; Indigo; Pure indigo; Indigo was synthesized by milling and cutting; 2,2 ′ - diazindene type indigo

CAS No.: 482-89-3

C16H10N2O2=262.27

Grade: CP

Content: ≥ 85.0%

Burning residue: ≤ 2.0%

Physicochemical properties: dark blue powder with copper like luster. Sublimed at about 300 ° C to form light reddish brown vapor. It decomposes at 390 ℃ and reacts with fuming sulfuric acid to form soluble sulfonic acid. It can be reduced by insurance powder, glucose and sodium hydroxide. It is soluble in hot aniline and chloroform and forms a blue solution. It is insoluble in water, ethanol, ether, dilute acid and alkali. The relative density is 1.35 and the maximum absorption wavelength is 602nm. Irritating

Purpose: biochemical research. Dissolved in sulfuric acid for colorimetric determination of nitrate, used as irreversible redox indicator in permanganate method and bromine method

Saving: RT