Scarlet R or red Scharlach R Biebrich scarlet R
Description
Sudan IV is a lysochrome (fat soluble dye) predominantly used for demonstrating triglycerides in frozen sections, but it may also stain some protein bound lipids in paraffin sections. It is less popular than oil red O as it has a more orange shade.
Compare this dye to the other common lysochromes sudan III, oil red O and sudan black B.
Gurr notes that a purified form of this dye has the name "Biebrich scarlet R". It should not be confused with the water soluble dye which is much more commonly referred to as Biebrich scarlet. This latter dye is not a lysochrome, but is used as a plasma stain in trichrome techniques.
References
- 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.