_THE SAMPLING AND ANALYSIS OF TANNING MATERIALS._
The International Association of Leather Trades Chemists -- The
American Official Association of Agricultural Chemists -- The sampling
of material -- Preparation of solution for analysis -- Extraction of
solid materials -- Total soluble matter -- Evaporations of solutions
-- The weighing of residues -- The determination of non-tannins -- The
hide-powder filter method -- The hide-powder shake method --
Determination of moisture -- Colour-measurement PAGE 300