在氢氧化钾的使用中，由于用户使用不当或储存不当，可能会导致发黄。这个发黄的时候产品还能用吗？接下来我们一起来看看。
　　In the use of potassium hydroxide, yellowing may occur due to improper use or storage by the user. Does the product still work when it's yellow? Let's take a look.
　　亚铁及其水溶液暴露在空气中更容易变黄。这是因为绿矾暴露在空气中会风化，而氢氧化钾的亚铁离子是可还原的，与空气接触时很容易被空气中的氧气或其他氧化性物质氧化成硫酸铁。其分子式由亚铁变为三价铁。颜色从蓝色/绿色变成了黄色或棕色。特别是在潮湿通风的地方，氧化速度会加快，更容易出现发黄。随着氧化程度的增加，逐渐变成块状，像石头一样变硬。
　　Ferrous iron and its aqueous solution turn yellow more easily when exposed to air. This is because alum will be weathered when exposed to air, while the ferrous ion of potassium hydroxide is reducible and can easily be oxidized to iron sulfate by oxygen or other oxidizing substances in the air when it comes into contact with air. Its molecular formula changes from ferrous iron to trivalent iron. The color changes from blue/green to yellow or brown. Especially in humid and ventilated places, the rate of oxidation will be accelerated, more prone to yellowing. As the degree of oxidation increases, it gradually becomes massive and hardens like a stone.
　　氢氧化钾用于灌溉植物不会产生不良影响，但其效果远不如变质前。因为亚铁离子被植物吸收，而大部分亚铁离子被氧化成三价铁离子，不容易被植物吸收。但如果用于污水处理的脱色或混凝，三价铁和二价铁在混凝效果上差别不大，三价铁离子不具有还原脱色作用。
　　Potassium hydroxide used to irrigate plants has no adverse effects, but its effects are far less than before deterioration. Because ferrous ions are absorbed by plants, and most ferrous ions are oxidized to trivalent iron ions, which are not easily absorbed by plants. But if used for sewage treatment decolorization or coagulation, ferric and ferric coagulation effect is not very different, ferric ion does not have reduction decolorization.

　　防止发黄的方法：提高包装的密封性能，减少与空气的接触，放在干燥的地方。对于液体产品，建议现在使用，或者在溶液中放入钉子、铁片、铁粉。此外，不要将碱性化学品和碱性肥料、化学氧化剂和氢氧化钾放在一起或凝结它们，因为它们是弱酸性的，会与碱性化学品反应，导致它们无效。
　　Method to prevent yellowing: improve the sealing performance of packaging, reduce the contact with air, put in a dry place. For liquid products, it is recommended to use now, or to put nails, iron sheets, iron powder in solution. Also, do not mix or coagulate alkaline chemicals with alkaline fertilizers, chemical oxidants and potassium hydroxide, as they are weakly acidic and will react with alkaline chemicals, making them ineffective.
　　如果使用不当发生烧伤后进行积极自救，如情况非常严重则要马上就医。因为烧伤时的初期自救对后续治疗的影响很大，这关系到伤口是否会感染扩大。所以从事与氢氧化钾这种强碱性物质相关的工作，一定要懂得自救的处理方法。
　　If the burn occurs after improper use of active self-help, if the situation is very serious, immediately seek medical attention. Because the initial self-rescue of burns has a great impact on subsequent treatment, it is related to whether the wound will expand infection. So engaged in and potassium hydroxide this strong alkaline material related to the work, we must know how to save themselves.
　　所以氢氧化钾出现了发黄的问题，产品本质上已经变质，建议用户不要再使用了，即使使用了也达不到原来的使用效果，可能会有不良反应，所以平时要注意妥善存放。更多内容就来网站www.jinhao360.com咨询吧！
　　Therefore, potassium hydroxide has the problem of yellowing, and the product has deteriorated in nature. It is recommended that users do not use it any more. Even if they use it, they can not achieve the original use effect, and there may be adverse reactions, so they should pay attention to proper storage at ordinary times. More content to the website consultation!