- Synonyms: Alum lacquer of carminic acid - C44H37AlCaO29·3H2O - M = 492,38 g/mol - CAS [1390-65-4] - EINECS-No.: 215-724-4 - Solub. in water: (20 ºC): insoluble - Tariff number: 3203 00 90 00 - Applications: microscopy, for biology, photography, manufacturing of inks, in food industry, cosmetics. SPECIFICATIONS Absorption maximum l1 (in DMSO): 563 - 571 nm Absorption maximum l2 (in DMSO): 525 - 533 nm Absorptivity (A1%/1 cm; l1 max) : 70 - 110 Absorptivity (A1%/1 cm; l2 max) : 100 - 150 loss on drying (110 ºC): max. 15 % residue on ignition: 9 - 17 %