Chapter XX 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