![blonde hair bleach blonde hair bleach](http://www.fabstrands.com/media/catalog/product/cache/1/image/9df78eab33525d08d6e5fb8d27136e95/b/l/bleach_blonde_clip_in_hair_extensions.jpg)
Why does bleach start to go bad? As with all manner of other hair products, it has to do with oxidation. If bleach (or sodium hypochlorite) is an active ingredient, our recommendation is to use this type of product immediately. While the peroxide may be ready to be mixed in for a year after you first start using it, the actual bleach you’ve just introduced into the mixture will spoil extremely quickly, as soon as 20 minutes after mixing.Īs such, if you’re going to mix up hair bleach, you’d better know what you’re doing and where you plan on applying it before getting started so you can add it before the bleach starts to go south.
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However, as demonstrated below, there are variations to this, and it can go bad sooner. There are lots of competing claims out there, including that hair bleach powder can last for up to a year after you’ve mixed it. However, it’s critical that you read the product packaging carefully – if the product contains bleach powder, hair developer, or other common chemicals and ingredients the expiration date will vary.ĭue to the various formulations that often include bleach powder and liquid developer, determining how long a hair bleach mixture lasts is by far the trickiest question to answer. In some cases, hair bleach can expire in as little as 20 minutes. How Long Does Hair Bleach Last? Can You Use Bleach Beyond Its Expiration Date?ĭoes hair bleach expire? Hair bleach expires quickly after opening the package.