20 developer to bleach ratio: How to get the perfect mix?

girl bites her lip because she doesn't know the proportions of developer and bleach

  • To get the perfect mix, you should use two parts 20 developer to one part bleach. This is the correct ratio.
  • For example, if you use 100 ml of a 20 developer, you should add 50 grams of bleach. Below, I’ll tell you some professional secrets to prepare the perfect mix.
  • Remember that if you use a 20-volume developer, you’ll only be able to lighten your hair up to two or three levels.


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The exact bleach to developer ratio is always 1 to 2


 Are you looking for the ingredients to lighten your hair with the exact ratio of a 20-volume developer and bleach? 


Well, I can’t help but frown. When I’m asked about bleaching, I stop and see.

Especially when people jump into preparing bleach on their own.

Let’s start at the beginning.

There are many different developer volumes.

  •  10 volume  can lighten hair up to two levels and doesn’t need to be mixed with the bleaching powder.
  •  20 volumes lightens hair up to two levels and must be mixed with the bleaching powder.
  •  30 volumes  is most often used to bleach hair.
  •  40 volumes,  which should only be used by professionals because it can irreversibly burn the hair.


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So, the first question I’ll ask you will be:

  • Why do you want to mix a 20-volume developer with the bleach?

20 volume developer
 That mixture will only lighten your hair color if your hair is light blonde or only two or three levels. 

In other words, if your hair is black, and you want to go blonde, you’ll need to use a 30-volume developer with the bleach, and you’ll also need to bleach your hair several times.


That said, I believe that bleaching, even if it’s done with a 20 or 30-volume developer, should be done by a professional. Why?


Because bleaching is a chemical process that opens the hair cuticles for the core to expel the hair pigments.

 If you don’t use the correct ratio of developer and bleach or leave the mixture on longer than indicated, you could burn your hair. 

And you know what happens when hair burns. The only solution is to remove the damaged part using scissors.


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But if you still want to do it on your own, the correct ratio for the mixture is two parts developer to one part bleaching powder.

Another key issue is how long you leave the mixture in your hair. People tend to think that the bleach can be on longer if they use a 20-vol developer. And that’s not correct.

I think I can relax now because I clarified what will happen to your hair when you bleach it.

So, it’s time to prepare the bleach to lighten it.


How to prepare the perfect bleach

20 volume developer and bleaching powder
You should always use plastic elements to prepare the bleach. That is to say, the measuring tool, the spoon to mix the ingredients, and the plastic container where you’ll make the mixture, must be made of plastic.


What do you need to prepare the mixture?

  • Plastic container
  • Plastic spoon or dye brush
  • Gloves
  • Plastic measuring cup such as a liquid soap cap
  • A 20-volume developer
  • Bleaching powder
  • Coconut oil
  • A face mask if you’re allergic because the bleaching powder has a very strong odor and can cause sneezing, tears, and rhinitis


How to prepare the bleach?

  • With gloves on, place one part 20-volume developer in the plastic container.
  • Rinse the tool, dry it, and place one part bleaching powder.
  • Whisk the ingredients with the plastic spoon or dye brush until there are no lumps.
  • Rinse the measuring spoon again and dry it so that there is no residue.
  • Place one more part 20-volume developer in the plastic container.
  • Whisk the whole mixture until it blends.
  • Add three drops of coconut oil to protect your hair during the process and mix again until all the ingredients are integrated.


If you followed these steps,  the consistency of the bleach will be similar to that of the conditioner.  The secret for a perfect mix is to use the same measuring container for the bleach and the 20 volume developer.

As regards how much bleach to prepare, it all depends on what you want to achieve.

  •  If you want to bleach all your hair,  you should use 50 gr of bleaching powder and 100 ml of 20 developer.
  •  Alternatively, to bleach just a few strands,  you should use 10 gr of bleaching powder and 20 ml of 20-volume developer.


How long to leave the 20-volume developer on

  •  If your mane is healthy,  you can leave the mixture on your hair for up to 40 minutes.
  •  If your mane has frizz,  you can leave the mixture in for up to 30 minutes.
  •  If your mane is dry,  apply coconut oil four hours before bleaching. Don’t rinse it. Leave the bleach on for 20 minutes.



Whether you use a 30 or 20-volume developer, you should always use the same ratio to prepare the bleaching mixture.

And that ratio will be two parts developer to one part bleach. That is, you’ll always use exactly twice as much developer as bleach.

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