Fast Sulphon Black F

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Fast Sulphon Black F
Fast Sulphon Black F.svg
IUPAC name
1-hydroxy-8-(2-hydroxy-1-naphthylazo)-2-(4-sulfo-1-naphthylazo)-naphthalene-3,6-disulfonic acid
Other names
Fast Sulphon Black
3D model (JSmol)
ECHA InfoCard 100.020.879
Molar mass 708.695
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Fast Sulphon Black F is a complexometric indicator used with EDTA, almost exclusively used in copper complexation determination.


Fast Sulphon Black is purple when complexed with copper, and turns green when titrated against EDTA,[1] as the EDTA displaces it, being the better complexing agent due to the chelate effect.


  1. ^ Trimukhe, K.D.; Varma, A.J. (2008). "Complexation of heavy metals by crosslinked chitin and its deacetylated derivatives". Carbohydrate Polymers. 71 (1): 66–73. doi:10.1016/j.carbpol.2007.05.016. 
  • Handbook of copper compounds and applications by H. Wayne Richardson (1997) (ISBN 0-82-478998-9)