Guinee Green B
Guinee green is an acid dye that is occasionally mentioned as a replacement for light green SF in Masson's trichrome. The dye's major drawback is that it fades. A substitute which is less prone to fading is Fast green FCF, a closely related dye.
In the past this dye was used as a food colouring, but is no longer approved for that purpose in the United States.
Compare the formula to Fast green FCF and Light green SF yellowish.
Susan Budavari, Editor, (1996)
The Merck Index, Ed. 12
Merck & Co., Inc., Whitehouse Station, NJ, USA
Edward Gurr, (1971)
Synthetic dyes in biology, medicine and chemistry
Academic Press, London, England.
Floyd J. Green, (1990)
The Sigma Aldrich Handbook of Stains, Dyes and Indicators
Aldrich Chemical Co., Milwaukee, WI, USA.