FIELD: chemistry.
SUBSTANCE: indicator composition contains analytical reagent solution, quartenised nitrogen salt, amine and mix solvent containing water and polar organic solvent, in ratio as follows, wt %: analytical reagent 0.5-5.0, quartenised nitrogen salt 2.0-8.0, amine 5.0-10.0, mix solvent 77.0-92.5. Analytical reagent of the composition is thiomercury compound of general formula: 
, where 
R1=-H; -Cl; -Br; -F or 
.
EFFECT: extended application of indicator composition and higher detecting reliability.
2 cl, 3 tbl
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