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丝制品不能用肥皂来搓洗。因为肥皂当中含有大量的碱,会使丝制品的酸性染料溶于水而退色;碱还会腐蚀丝质,使衣服寿命缩短。当然,更不能用碱水来洗丝绸衣服。如果用肥皂洗丝绸,最好在水中放一点明矾,明矾的主要成分之一是硫酸铝。硫酸铝水解后变成白色胶状的氢氧化铝,氢氧化铝可以降低肥皂的碱性,因此对丝制品的腐蚀就
Silk products cannot be washed with soap. Because the soap contains a large amount of alkali, the acid dyes of the silk products dissolve in water and fade; the alkali also erodes the silk and shortens the life of the clothes. Of course, you can’t wash your silk clothes with alkaline water. If you wash silk with soap, it is best to put a little alum in water. One of the main ingredients of alum is aluminum sulfate. After the hydrolysis of aluminum sulfate into a white colloidal aluminum hydroxide, aluminum hydroxide can reduce the alkalinity of soap, so the corrosion of silk products