Acid Surrogate Standard Back Catalog number: 21005 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 3907.21-1G Curcumin (E 100), neat, Solvent-neat, Unit 1g, # of units-1, Cas.no. 458-37-7 Price on request 0032.22-10UG (5)Helicene, neat, Solvent-neat, Unit ca. 10µg , # of units-1, Cas.no. 188-52-3 Price on request XA11600100AC Chlorpyrifos-D10, 100µg/mL in Acetone, 1ml Price on request