R-acid Reaction, Procter-Hirst Reagents for Neradol D tannage Resites Resitol Resols Resorcinol Resorcylic acid, [Greek: b]- Retene Rosins, acid Rosolic acid Rufigallic acid S S-acid Salicylic acid Salicylic acid phenyl ester Salicyl-_p_-hydroxybenzoic acid Salol Silver oxide Solution salt Solvenol Structure of tannin Sulphinic acid Sulphite cellulose extract Sulphite lye Sulphonamide Sulphonic acids, aromatic Sulphonic chloride Sulphur Sulphur tannage Sulphuric acid-free Neradol D Sulphuric acid in leather Syringoyl-_p_-hydroxybenzoic acid T Tannin Tannin action, real Tannin analysis Tanning matters Tannin molecule Tannin, pure Tannophor Test tannage Tetradepsides Tetragalloyl-[Greek: a]-methylglucoside Tetramethylellagic acid Tetroxydiphenyldimethylolide Thionaphtholsulphonic acid Thiosulphonic acid Thorium salts Thymol Toluidoanthraquinone, l-_m_- Total solids Total solubles Tribromophenol Tribromopyrogallic acid Tricarbomethoxygalloyl chloride Tridepside Trihydroxybenzenes Trinitrophenol Triphenylmethane V Valonea Vanadium salts Vanillic acid Vanilloyl-di-_p_-oxybenzoyl-_p_-hydroxybenzoic acid Vanilloyl-_p_-hydroxybenzoic acid Vanilloyl vanillin X Xanthenes Z Zinc salts Zirconium salts