13 января, 2016 
Pokraskin Titanium trichloride is an extremely easily oxidized material which dissolves in water to form a violet solution. On oxidation, it is converted to the colorless titanic acid, Ti(OH)4. Using a titanium trichloride solution of known strength, it is possible to reduce quantitatively dyes of various classes, the endpoint being taken as the point where the color of the dye disappears.
All azo dyes, as well as thiazine, safranine, triphenylmethane, indigo, and many other dyes, can be analyzed with great accuracy by means of
titanium trichloride. The method will be described here briefly, but reference should be made to Knecht’s publications for further details.
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