- The ratio for making a bleach bath is this: equal parts of developer and bleach powder. And to that mixture, you should add twice as much shampoo.
- If your hair is fine or short, the exact quantities to make a bleach bath are 25 ml of developer, 25 grams of bleach powder, and 100 ml of shampoo.
- If your hair is thick or long, the exact quantities to make a bleach bath are 50 ml of developer, 50 grams of bleach powder, and 200 ml of shampoo.
YOU MAY ALSO BE INTERESTED IN: What shampoo to use for bleach bath? What ingredients should it have?
I think I’ve made things pretty easy for you.
Because not only have I told you the ratio to make a bleach bath. I also gave you the exact amounts of each ingredient you need to mix to make it, according to your hair type and length.
And I would like you to value these proportions and quantities I’ve given you. They’re the quantities that we professionals use in the salon to make a bleach bath. Therefore, you can use this bleach bath with an absolute peace of mind.
Of course, I’ll give you some other recommendations as well. But we’ll leave that for later. I invite you to focus on the ratio to make a bleach bath.
YOU MAY ALSO LIKE TO READ: What shampoo to use for bleach bath? What ingredients should it have?
How to mix and prepare the exact proportions for a bleach bath
You will need a few fundamental items:
- I recommend you use 20-volume developer . It has enough lightening power to make an effective bleach bath. If your hair is fine or short, you need 25 ml. And if your hair is thick or long, you need 50 ml.
- Bleach powder . If your hair is fine or short you need 25 grams and if your hair is thick or long, you need 50 grams.
- Use a shampoo containing ingredients such as avocado or tea tree oil.
- A plastic container and plastic spoon. You can’t use metal containers or spoons, because the developer oxidizes with metal and loses its chemical strength.
Preparing the bleach bath
- Place the exact amounts of bleach powder and developer in the plastic container. Remember to take your hair’s type into account with your measurements.
- Whisk until you get a smooth, creamy, and lump-free mixture.
- Add the shampoo in small quantities to incorporate it and mix it in little by little. If your hair is short or fine, it will be 100 ml; if it is thick or long, it will be 200 ml.
- You can apply the bleach bath to your hair when the mixture is creamy and has no lumps.
Please note: if your hair is very dry or you’ve previously bleached it, you may need to prepare a larger amount of bleach bath. Porous hair absorbs any type of product you apply more quickly.
If this is your case, I recommend doubling the quantities to prepare your bleach bath.
Three tips from a professional hairdresser to prevent the bleach bath from damaging your hair
Before preparing your bleach bath, check the expiration date of the ingredients
It sounds silly, but I can assure you many use expired products without even realizing it. All cosmetic products have expiration dates , even eye shadows, which might just appear to be harmless powders.
However, here we’re talking about peroxide and bleach powder, two chemicals. Check the packaging and expiration date. If the products have expired, discard them. Buy new ones to prepare your bleach bath. It’s not worth the risk.
Don’t leave the bleach bath on your hair for more than 45 minutes
Both the developer and the bleach powder have a maximum reaction time. Leaving the bleach bath on your hair for more than 45 minutes will only ruin your hair.
You can use a bleach bath once every three weeks
Although a bleach bath is gentler than bleaching, it’s still a chemical process.
And the damage is cumulative. For instance, what if you use a bleach bath to lighten your hair two shades, but after rinsing out the mixture, you don’t get to the desired color? You’ll have to wait three weeks to reapply the bleach bath.
In the meantime, apply a coconut or argan oil mask to restore moisture and nutrients to your hair.
Don’t store or save leftover bleach baths
If you have any leftover bleach bath, you should throw it away. Once you mix the developer and bleach powder, the chemical reaction begins, which starts to deteriorate after a while. Therefore, if you use a bleach bath that you had in storage or on hold, it won’t lighten your hair; it will only destroy it.
You won’t ruin your hair if you respect the correct ratio, quantities, and these tips for making your bleach bath. And that should be your most important goal.