Specification Product Name α-NAPHTHOLBENZENE Synonyms 4,4'-(a-Hydroxybenzylidene)di-1-naphthol; a,a-Bis (4-hydroxy-1-naphthyl)benzyl alcohol p-Naphtholbenzein CAS NO. 145-50-6 Molecular Formula C27H8O2 Formula Weight 374.44 Appearance Red-Brown flakes/Powder Structure     Tests    Limits Specific Extinction (1%/1cm) - 350 minimum Maximum of Absorption (in 0.01M NaOH) - 644.0 - 652.0 nm Visual Transition Interval: - From pH 8.2 (orange) To pH 10.0 (blue) Chloride (Cl) - 5000 ppm maximum         REVISED: 1-1-2012