![]() While bleaching can dramatically lighten your hair color by stripping away your natural color in favor of bleached platinum blonde, that’s the only coloring effect it can accomplish. On the other hand, there’s a reason why “Bleach Blonde” is a hair and fashion identity unto itself, but we never hear about a “Bleach Redhead” or “Bleach Brunette.” While both change the appearance of your hair, bleach does this by stripping away your natural hair color, whereas hair dye essentially “paints” over it.Īs a result, while both can change your appearance, bleaching your hair can be seen as a bigger step since it’s permanent, whereas different hair dyes last for different periods of time but aren’t quite as much of a long-term commitment. ![]() After all, both are used to change your hair color, so can we consider them as one thing here?įor practical purposes, box dye and a bottle of bleach have similar properties in terms of longevity and spoilage, which is why you’ll see some overlap in our discussion of how long they last, why they go bad, and what you can do to preserve them.Īt the same time, however, there are some differences between bleach and hair dye that are worth noting.įor one thing, bleach and hair dye work in different ways. Bleaching: Liquid and Powder Formīefore we go much further, it’s worth drawing a distinction between hair dye and bleach in particular. On the other hand, hair dye gone bad can also dye your hair a Grinch-y greenish color, to say nothing of the rancid odor that can accompany it if it’s degraded. ![]() In order to achieve the best results, we recommend storing hair products in a cool, dry place. So, we don’t recommend using bleach beyond its expiry date or any expired hair product.īy contrast, box hair dye can last up to three years in optimal conditions. Once this process begins, not only will the hair bleach start to degrade, but it will start to become dangerous to use. 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. 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. Therefore, it is recommended to use hair bleach immediately after mixing and not to use any expired hair products. Expired hair bleach can cause negative effects, including bacterial infections, skin irritation, and hair loss. Peroxide, a key ingredient in hair bleach, can also expire as soon as six months after opening the bottle. The actual bleach that has been introduced into the mixture spoils quickly and becomes dangerous to use. Once opened, hair bleach can expire in as little as 20 minutes due to the oxidation process. Hair bleach does expire, and its expiration date can vary depending on the formulation. 5.8 Don’t Use Bleach Beyond Its Shelf Life or Expired Developer.5.6 When Mixed How Long Can Hair Bleach Sit Out?.5.4 Does Hair Bleach Expire if Unopened?.5.2 What Happens if You Use Old Bleach on Your Hair?.5.1 How Do You Know if Bleach Is Expired?.2 How Long Does Hair Bleach Last? Can You Use Bleach Beyond Its Expiration Date?.
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