D2807 Standard Test Method for Chromic Oxide in Leather (Perchloric Acid Oxidation)
D2875 Standard Test Method for Insoluble Ash of Vegetable-Tanned Leather
D6401 Standard Test Method for Determining Non-Tannins and Tannin in Extracts of Vegetable Tanning Materials
D2807 Test Method for Chromic Oxide in Leather (Perchloric Acid Oxidation)
D2813 Practice for Sampling Leather for Physical and Chemical Tests