Description
Carmine (C.I. 75470), for microscopy, Molar mass (M) 492,38 g/mol, Density (D) 1,355 to 1,382 g/cm³, CAS No. 1390-65-4, EC No. 215-724-4, Empirical formula C22H20O13
Water-insoluble natural dye, obtained from dried female scale insects (Cochenille). Main ingredient is carminic acid. For use as a dye in microscopy it is applied in conjunction with a mordant, usually based on aluminium, producing a well-staining calcium aluminium lake of carminic acid.