Products

CAS Number

145-50-6

Formula

C₂₇H₈O₂

Weight

374,44

Synonym: 4,4'-(a-Hydroxybenzylidene)di-1-naphthol; a,a-Bis (4-hydroxy-1-naphthyl)benzyl alcohol p-Naphtholbenzein

Appearance	Dark red to red-brown to brown-black to orange-brown powder
Visual transition interval	Yellow to green pH 8,2 (yellow to orange) to pH 10 (green-blue)
Absorption maxima in acetic perchloric acid 0,1 mol/L	622 - 626 nm