14 января, 2016 
Pokraskin Reduction takes place according to the scheme:
(X)3OH + 2 ТіСІз + 2 HC1 2 ТіС14 + (Х)3Н + Н20
Titration is carried out to a colorless endpoint, which is usually very sharp. Knecht has titrated fuchsin, eosin, malachite green, acid
green, aniline blue, rhodamine, and other dyes by this method.
Safranine behaves exactly like methylene blue. The examples given show that the Knecht method is, in many cases, more rapid and more certain than dyeing tests, and it is, therefore, worthy of recommendation.
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