在氫氧化鉀的使用中，由于用戶使用不當或儲存不當，可能會導致發黃。這個發黃的時候產品還能用嗎？接下來我們一起來看看。

　　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.

　　亞鐵及其水溶液暴露在空氣中更容易變黃。這是因為綠礬暴露在空氣中會風化，而氫氧化鉀的亞鐵離子是可還原的，與空氣接觸時很容易被空氣中的氧氣或其他氧化性物質氧化成硫酸鐵。其分子式由亞鐵變為三價鐵。顏色從藍色/綠色變成了黃色或棕色。特別是在潮濕通風的地方，氧化速度會加快，更容易出現發黃。隨著氧化程度的增加，逐漸變成塊狀，像石頭一樣變硬。

　　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.

　　氫氧化鉀用于灌溉植物不會產生不良影響，但其效果遠不如變質前。因為亞鐵離子被植物吸收，而大部分亞鐵離子被氧化成三價鐵離子，不容易被植物吸收。但如果用于污水處理的脫色或混凝，三價鐵和二價鐵在混凝效果上差別不大，三價鐵離子不具有還原脫色作用。

　　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.

　　防止發黃的方法：提高包裝的密封性能，減少與空氣的接觸，放在干燥的地方。對于液體產品，建議現在使用，或者在溶液中放入釘子、鐵片、鐵粉。此外，不要將堿性化學品和堿性肥料、化學氧化劑和氫氧化鉀放在一起或凝結它們，因為它們是弱酸性的，會與堿性化學品反應，導致它們無效。

　　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.

　　如果使用不當發生燒傷后進行積極自救，如情況非常嚴重則要馬上就醫。因為燒傷時的初期自救對后續的影響很大，這關系到傷口是否會感染擴大。所以從事與氫氧化鉀這種強堿性物質相關的工作，一定要懂得自救的處理方法。

　　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.

　　所以氫氧化鉀出現了發黃的問題，產品本質上已經變質，建議用戶不要再使用了，即使使用了也達不到原來的使用效果，可能會有不良反應，所以平時要注意妥善存放。更多內容就來網站www.shrisa.cn咨詢吧！

　　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!