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Acacia acetic acetic acid acid agitators amount analysis Archimedean screw autoclaves Bark9 bisulphite boiling Botanical Name bottom Brugiera catechol catechol group catechol tannin cellulose Cent centrifugal Ceriops chemical composition concentration contains decolorising divi-divi dried ellagic acid examined extract factories filter filtrate Fraymouth gambier give heating hemlock hide powder Imperial Institute Indian IOO.OO kaolin kilos leach Leather World liquid extract liquor litre loss mangrove manufacture method mimosa bark Moisture myrobalams oak bark oakwood obtained open vat osage orange Paessler Patent plant pods precipitation pressure produced pumped pyrogallol quantity quebracho quebracho extract Rhizophora sample shown in Fig sodium sodium bisulphite solid extract Soluble non-tannins Soluble non-tannins Insoluble spent bark spent material steam substances sugar sulphite sulphite cellulose extract Sulphur sumach tanners tannin content Tannin Soluble non-tannins tannin solution tanning extract tanning materials tanstuff temperature total extractable matter tree tubes vacuum valonia wattle wood yield