soaps are made fron a fat or fatty acid and an alkali. they lathetr and produce a foam which entraps dirt and grease. there are many kinds of soaps. cleaners contain a solvent, such as naphtha, with or without a soap. abrasive cleaners are soap pastes containing powdered pumice, stone, ailica, etc.
配方组成:
water/19 immersion. immerse the part of the fabric with the rust or ink spot A) ammanium sulfide solution/1 water/19 alternately in solutions A and B , rinsing with watet after each rust and ink remover B) oxal8c acid/1
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