The general rule of thumb is that hair bleach can sit out for about 20 to 30 minutes after it's been mixed, depending on the type of bleach and the environment it's in. But, let's be real, time flies when you're chatting with your hairdresser or scrolling through your phone, and before you know it, that 20 minutes has turned into an hour - or worse, two hours!
If you leave the bleach out for too long, it can start to degrade, which means it won't work as effectively, and you might end up with patchy or uneven results. And, if you're using a high-lift bleach, it can even become volatile and cause irritation to your skin or scalp - ouch! So, it's essential to keep an eye on the clock and use that bleach before it's too late!
But, what happens if you accidentally leave the bleach out for too long? Well, don't panic! Just discard it and start fresh with a new batch. It's better to be safe than sorry, especially when it comes to your precious locks. And, if you're feeling extra cautious, you can always check the manufacturer's instructions for specific guidance on how long their particular bleach can sit out.
How Long Does Hair Bleach Stay Active After Mixing? | ShunSalon
