- ASTM D4901, 1999 Edition Reapproved in 2016, Standard Practice for Preparation of Solution of Liquid Vegetable Tannin Extracts
- ASTM D6020, 2000 Edition Reapproved in 2016, Standard Practice for Calculation of (Non-Mineral) Combined Tanning Agents and Degree of Tannage
- ASTM D6401, 1999 Edition Reapproved in 2016, Standard Test Method for Determining Non-Tannins and Tannin in Extracts of Vegetable Tanning Materials
- ASTM D6656, 2016 Edition, Standard Test Method for Determination of Chromic Oxide in Wet Blue (Perchloric Acid Oxidation)
For more standards like these, please refer to our Document Center List of Standards on Processes and Auxiliary Materials.