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 caustic soda chloride chrome liquor chrome tanned coat Color Index crystals dioxide dissolved drain the drum drum drum and mill emulsion fatliquor fig soap formic acid grades grain H₂O heated hides hydrated lime leather leather finishes liquid melting point Mill 30 minutes mill for 30 mixture moellon naphtha neatsfoot oil nigrosine obtained one-half hour orange oxide paddle paraffin pickle pigment powder produce quebracho removed retan rocker shades shellac skins soaking soda ash sodium sulfide sole leather soluble in water specific gravity splits sulfate sulfide sulfonated sulfonated cod oil sulfuric acid sulphuric tannage tanned leather tanner tannin tanning materials temperature type of leather unhairing vegetable tanned washed yellow