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15 minutes 24 hours 50 gals acetic acid will neutralize added alcohol ammonia amount applied bating bicarbonate of soda blue boiling borax brown buffed calcium carbon carnauba wax casein cent tannin chloride chrome liquor chrome tanned coat Color Index conc crystals degreasing dioxide dissolved drain the drum drum drum and mill extra fatliquor fig soap flesh gals grades grain heated hides hydrated lime leather leather finishes liquid Mill 30 minutes mill for 30 mixture moellon naphtha neatsfoot oil nigrosine obtained one-half hour orange oxide paddle vat paddle wheel pickle pigment piled powder prepared produce quebracho removed retan salt shades shellac skins soaking soda ash sodium sulfide sole leather specific gravity sulfate sulfonated sulfonated cod oil sulfuric acid syntan tank tannage tanned leather tanner tannin tanning materials temperature titanium dioxide type of leather unhairing vegetable tanned washed water at 70 yellow