How much is 1 part bleach to 2 parts developer?

woman think before bleaching her hair

  • To prepare the product to bleach your hair, you should use 1 part bleach to 2 parts of the developer.
  • This means that if you use 100 grams of bleach, you should use 200 grams of the developer.
  • And if you use 50 grams of bleach, you should use 100 grams of the developer.
  • Therefore, you always use twice as much developer as bleach.
  • Also, keep in mind that you must use the same measuring element to control the exact amount of bleach and developer.
  • I’ll tell you the professional proportions I use to prepare the bleach according to the length of the hair.


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Are you about to prepare the bleach, and  you don’t know what it means to mix 1 part bleach to 2 parts developer? 


It means that you should use twice the developer as bleach.

And to measure the right proportions, you need a measuring device.


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In this case, it isn’t valid to use approximate measures. This doesn’t exist in colorimetry.

And the same thing happens when you bake a cake.

Have you seen the TV show, “Masterchef?”

If you never saw it, you missed a great show when the judges challenge the contestants with very harsh words for not measuring “with absolute accuracy” the proportions of the ingredients.


I understand that’s a show. But as a professional, I understand the judges.

If you want a cake to be perfect, the proportions of egg, flour, and other ingredients must be exact. Otherwise, the results won’t be as expected.


The same thing happens with bleach.  If the proportions of the bleach aren’t right, you won’t be able to lighten your hair. 

But you can also ruin your hair.


If a cake is not as expected, you can throw it away. However, if your hair is ruined by bad bleach, you’ll have to cut it off.

But, cheer up, it’s just a matter of understanding the exact proportions of the bleach. And that’s what I’ll talk about next.


How to calculate 1 part of bleach to 2 parts of a developer?

tablespoon of bleaching powder
Let’s start at the beginning. The most important thing is to gather all the materials to prepare the bleaching mixture. Of course, the developer and the bleaching agent mustn’t be missing.


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But you can’t miss the measuring element to measure the quantities.

You can use the measuring device included in the professional plastic container, which is sold in any store, or other elements such as baking spoons.

Have you got everything?

That’s fine. Before measuring the amounts, I remind you that bleaching is a very aggressive chemical process for the hair. Imagine to what extent you could damage your hair if you made a mistake in the ratio of developer to bleach.


The developer has a creamy consistency to hydrate the hair during the process. The bleach removes large amounts of water molecules from the hair during bleaching.

  •  If you put less developer and more bleach  when you prepare the mixture, the resulting product would be to hard to distribute to your hair.
  • su_highlight background=”#ff99f8″]Alternatively, if there’s more developer than bleach,[/su_highlight] the product would be very creamy and slip out of the hair very easily. It would also have less lightening power.


Therefore, you must respect the proportions:

  •  1 part bleaching powder to 2 parts developer.  

Any examples?

  • 50 grams of bleach per 100 ml of developer.
  • 75 grams of bleach per 150 ml grams of the developer.
  • 2 ounces of bleach and 4 ounces of the developer.

In short,  use twice the amount of developer to the bleach. 


You should also consider your hair length to know how much bleach to prepare using the exact proportions.

  • Very short hair: 10 gr of bleach to 20 ml of developer
  • Short hair: 15 g of bleach to 30 ml of developer
  • Medium hair: 20 g of bleach to 40 ml of developer
  • Long hair: 25 g of bleach to 50 ml of developer
  • Extra long hair: 50 g of bleach to 100 ml of developer


How to check that the proportions of the bleach are correct?

The consistency should be similar to that of any conditioner. It should be creamy to distribute it easily, but not drip.



So, “1 part bleach to 2 parts developer” is the same as saying that you should use twice as much developer as bleach.

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