Indigo carmine, certified

Shunway's stain for animal embryos. Used with Acid Fuchsin for staining Negri bodies. Stain Tech., 5, 34 (1928)
Counterstain to Hematoxylin for staining vaginal smears. Am. J. Anat., 61, 505 (1937).

(Acid Blue 74; Carmine Blue; Indigotine 1, 1A)
C₁₆H₈N₂O₈S₂Na₂   F.W.466.36   CAS #860-22-0
Dye content: approx. 85%
Solubility: 1.3% Water; 0.0% Alcohol; 4.0% Cellosolve; 2.85% Glycol; 0.0% Xylene