Pontamine Sky Blue 5B
A large molecular weight dye named pontamine sky blue was suggested as a substitute for methyl blue in Lendrum’s MSB technique for fibrin. It is likely this dye, but positive identification is not possible as a CI number was not given. It was recommended with a comment that its use reduced the tendency of some fibrin to stain with the blue dye.
Edward Gurr, (1971)
Synthetic dyes in biology, medicine and chemistry
Academic Press, London, England.
Bancroft, J.D. and Stevens A. (1982)
Theory and practice of histological techniques Ed. 2
Churchill Livingstone, Edinburgh & London, UK.