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:
B) strong liquid ammonia(28%)/0.25 A) kerosene/2.00 denatured nalcohol/0.25 oleic acid/1.00 paint-brush cleaner
配制方法:
stir slowly b into a until a smootdh muxture resukts. to clean brushes, pour into a can and leave the brushes in it overnight. in the morming, wash out with warm water.
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