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100 per cent acetyl addition agitator to turn Alizarine alkaline solution amine aniline azo dyes benzene benzidine beta naphthol cake caustic soda solution cent material complete coupling diazotized cracked ice delivered into tub depth diazo benzene diazo solution Diazo-1 disazo dyes entered in tub factory feet deep feet in diameter final volume floor ice is entered ice tub inches intermediates liquor manufacture meta phenylene diamine metanilate Method.—A tub Molecular Weight mono azo dye muriatic acid neutral nitraniline nitrite of soda nitrous acid Orange Orange G phenol Plate F Ponceau 2R pounds of cracked pounds of ice pounds of muriatic pounds of soda pounds of technical pounds of water precipitation Prepared by coupling prepared in tub production reaction revolutions per minute salicylic acid soda ash sodium sulfanilic acid sulfonic acid technical nitrite tetrazotized thirty minutes thirty revolutions toluidine tub 6 feet water is entered water tub yield