Metanil yellow was used in one variant of Masson's trichrome to stain collagen yellow in contrast to the red muscle, but is not in common used.
R. D. Lillie.
Conn's Biological Stains
Williams & Wilkins, Baltimore, MD., U.S.A.
Edward Gurr, (1971)
Synthetic dyes in biology, medicine and chemistry
Academic Press, London, England
Aldrich chemical catalogue, (1992)
Aldrich Chemical Company, Milwaukee, WI, USA.