Aluminium take of carminic acid  Suitable for use in Orth’s Lithium carminic technique. l1 max abs in DMSO 563-571 nm l2 max abs in DMSO 525-533 nm A1%, 1cm, l1 max min 70.0% A1%, 1cm, l2 max min 100.0% Ration â max.P+/-15 nm (at 528nm)1.00-1.10 Loss on drying at 110o C max 15.0%