Tannin precipitates, and the precipitate is soluble in excess of the reagent.
Moisten samples of cotton and of wool with Millon's reagent.
Treat a sample of the flour in a test tube with this reagent.
If this is not the case a slight excess of the reagent is added.
It is a reagent which adds new qualities and rearranges what is received.
This reagent is usually added ...