Tanning Processes |
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15 minutes 24 hours 25 gals 50 gals acetic acid will neutralize added alcohol alkali ammonia amount aniline applied bating bleached blue boiling borax brown calcium carbon carnauba wax casein chloride chrome liquor chrome tanned coat Color Index crystals dioxide dissolved drain the drum drum drum and mill extract fast red fatliquor fig soap grades grain heated hides hydrated lime leather leather finishes liquid melting point Mill 30 minutes mill for 30 mixture names and marks naphtha neatsfoot oil nigrosine obtained one-half hour orange oxide paddle pickle pigment powder produce quebracho removed retan shades shellac skins soaking soda ash sodium sulfide sole leather soluble in water specific gravity sulfate sulfide sulfonated sulfonated cod oil sulfuric acid sulphuric tannage tanned leather tanner tannin tanning industry tanning materials temperature titanium titanium dioxide type of leather unhairing washed wool grease yellow