Sudan IV (CAS: 85-83-6)

Basic information

Sudan IV is a lysochrome (fat-soluble dye) diazo dye used for the staining of lipids, triglycerides and 

lipoproteins on frozen paraffinsections.It has the appearance of reddish brown crystals with melting

point 199 °C and maximum absorption at 520(357) nm.Is the laboratory commonly used chemical

reagents,toxicity of micro.Fat can be Sudan red Ⅳ dyed red.

Sudan IV is one of the dyes used for Sudan staining. Similar dyes include Oil Red O, Sudan III, and 

Sudan Black B. Staining is an important biochemical technique, offering the ability to visually qualify

the presence of the fatty compound of interest without isolating it. For staining purposes Sudan IV

can be made up in propylene glycol. 

Application

Sudan IV mainly used in oil, water, soap, candles, rubber toys, plastic productsan .Sudan IV is also used

in United Kingdom as a fuel dye to dye lower-taxed heating oil.

Matters need attention

Sudan IV have been classified as category 3 carcinogens by the International Agency for Research on Cancer.