MEDICAL AND BIOLOGICAL STAINING TECHNIQUES 



SUDAN BLACK 



The use of Sudan Black, also known as Sudan Black B, has 

 been described in various works on Histochemistry. As far as I 

 am aware, the correct structural formula of the Sudan Black 

 molecule has not yet been disclosed in any literature published in 

 any country, although it appears that this information has fre- 

 quently been sought after by medical and biological research 

 workers. It may, therefore, be of interest and help to research 

 workers to give the formula here : 



H 



^^N = N-<;^_^N = N-<^_^N\ yCR 



\ / \ >~N/ \CH. 



I 

 H 



The molecular weight and other information regarding Sudan 

 Black will be found on page 435. 



34^ 



