BMP (Butynediol propoxylate) (C10H18O4) CAS No. 1606-79-7 Appearance: Clear brown liquid Assay: â?¥95% Density g/cm3 (20): 1.07~1.09 PH: 4.0~7.0 Refractive Index(20): 1.4640~1.4726 Application: Lasting brightener, weak leveling agent for nickel plating