3 Neutralizing
Wet-blueisacidanddevelopsacidityonstanding.Underacidconditionstheleatherproteiniscationicandthisisfurtheraccentuatedbythemineralretannage.Consequentlynegativelychargedcolloids,suchasvegetabletans,amino-resins,dystuffs,fatliquors,etc.willreadilyprecipitate ...... （共8540字） [阅读本文]>>
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