Now many people will check the ingredient list when buying cosmetics, and there is no exception when buying facial cleanser. However, when we check, we will find that there will be potassium hydroxide in many facial cleansers. We all know that this is an alkaline substance, so it will not cause damage to the skin when used. Can we use it? Let's learn about it below.

堿是制作清潔用品一定需要的，一般制造洗面奶的時候都需要使用，固態皂時一般都會使用氫氧化鈉，因為它們都是堿性物質。堿與油脂在反應之后會轉化成皂和甘油，成熟皂的主要成分一般都是脂肪酸鹽，這是一種表面活性劑，有親油端和親水端。親油端會吸收皮膚中的過氧化油脂還有污垢，而在沖水的時候親水端就會與水結合從而帶走污垢，這樣就起到了清潔的作用。這也就是固體肥皂或洗面奶的清潔原理。

Alkali is necessary for making cleaning products. It is generally used when making facial cleanser. Sodium hydroxide is generally used when making solid soap, because they are alkaline substances. After the reaction between alkali and oil, it will be transformed into soap and glycerol. The main component of mature soap is generally fatty acid salt, which is a surfactant with lipophilic end and hydrophilic end. The lipophilic end will absorb the peroxide oil and dirt in the skin, and when flushing, the hydrophilic end will combine with water to take away the dirt, which plays a cleaning role. This is the cleaning principle of solid soap or facial cleanser.

洗面奶中的氫氧化鉀一般都不會對皮膚產生傷害。因為堿性在與油脂混合反應后，就已經不是堿性了。而且可以促使油脂水解，與水解后的酸發生中和反應，而我們在成分表中看見的月桂酸、肉豆蔻酸就是和堿性進行反應的，從而生成脂肪酸鉀起到清潔的作用。

Potassium hydroxide in facial cleanser generally does not harm the skin. Because alkaline is not alkaline after mixing with oil. Moreover, it can promote the hydrolysis of oil and neutralize with the hydrolyzed acid, and the lauric acid and myristic acid we see in the composition table react with alkali to produce fatty acid potassium and play a cleaning role.

相信大家看完上面的解釋，可以知道含有氫氧化鉀的洗面奶是可以使用的，而且其清潔效果也是比較好的，不過在洗完臉之后也需要做好后續的保濕補水的工作

I believe that after reading the above explanation, you can know that the facial cleanser containing potassium hydroxide can be used, and its cleaning effect is also relatively good. However, after washing the face, you also need to do the follow-up moisturizing and moisturizing work