• British Pharmacopoeia Volume IV
  • Appendices
  • Appendix I A. General Reagents

Xylenol Orange
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Xylenol Orange [3H-2,1-Benzoxathiol-3-ylidenebis(6-hydroxy-5-methyl-m-phenylene)methylenenitrilo]tetra-acetic acid S,S-dioxide tetrasodium salt; C31H28N2Na4O13S  =  761 (3618-43-7)

General reagent grade of commerce.

A reddish brown, crystalline powder.

Produces a violet colour with mercury, lead, zinc and certain other metal ions, in alkaline solutions. When metal ions are absent, for example in the presence of an excess of disodium edetate, the solution is yellow.