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How Long to Leave Hydrogen Peroxide on Hair

《论发间置双氧之时长》

世有染发之法,常用双氧水。然于发间置双氧水之时长,实关染发之效与发之损伤。

若欲色浅而匀,且护发无损,其时长需慎度。初染或发粗硬者,可置二十至三十刻。然发细软或曾染者,时长宜减,约十五至二十刻足矣。

时长过久,虽色易显,然发受损必烈,致干枯毛糙,失其柔亮。若时短,则色不达意,难遂人愿。

故染发用双氧水,必详审发之质、往昔染况,以定适当时长,方可得悦目之色,且保发之康健。



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