Internal Standard Back Catalog number: 95592 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 10857.20-K-ME Quinine hemisulfate,1000 µg base/mL,MeOH,1mL Price on request 92775 Chlorophenols Standard Price on request 11486.22-10MG Phenolphthaleine dimethyl ether,neat,neat,10mg, Price on request