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24 hours 30 minutes acid added alcohol ammonia amount appears applied basic bating bichromate blue boiling brown carbon casein cent chrome coat cod oil cold color Color Index conc condition contain crystals desired direct dissolved drain drum dyes extent extra extract fatliquor finish five flesh four gals given grades grain grease green heated hides important industry known leather light lime liquid liquor materials matter melting mill minutes mixed mixture names natural necessary neutralize obtained operation orange paddle period permitted pickle pigment placed powder practically prepared produce quantities removed salt shades sides skins soaking soap soda sodium sole leather solid soluble solution specific gravity splits sulfate sulfuric acid tannage tanner tannin tanning temperature usually vary washed weight whole wool yellow