How to dilute 40 volume developer to 30?

Author: Isidro Hodkiewicz III  |  Last update: Sunday, September 7, 2025

1 part 40 volume, 3 parts water =10 volume. Equal parts 40 volume and water = 20 volume. 3 parts 40 volume and 1 part water =30 volume.

What is the mixing ratio for 30 volume developer?

Mix the Developer and Dye: Combine the 30 volume developer with your chosen hair dye in the recommended ratio (usually 1:1 or 1:2, depending on the product). Apply to Hair: Start at the roots where grey hairs are most prominent.

What do I mix with a 40 volume developer?

- For every 1 part of 40 volume developer, you would mix it with 0.5 parts of water. If you want to make 100 mL of 30 volume developer: 40 volume developer needed: 100 mL × (30/40) = 75 mL Water needed: 100 mL - 75 mL = 25 mL Mix 75 mL of 40 volume developer with 25 mL of water to create 100 mL of 30 volume developer.

What happens if I use 40 developer instead of 30?

Developer choice going lighter with regular color

Use 20 Vol if you are aiming for a 1-2 level lift (and if you have grey hair that needs covering). Use 30 Vol if you are aiming for a 2-3 level lift. Use 40 Vol if you are aiming for a 3 level lift and if the hair is particularly difficult to color.

How to dilute 40 volume to 20?

Mixed equal parts distilled water with 40 volume to make 20 volume. 1 oz distilled water and 1 oz 40 volume developer will give you 2 oz of 20 volume developer. But you must use distilled water not tap water.

hair color developer explained- 10, 20, 30 & 40 volume | 2024

How do you dilute volume?

To make a fixed amount of a dilute solution from a stock solution, you can use the formula: C1V1 = C2V2 where: V1 = Volume of stock solution needed to make the new solution. C1 = Concentration of stock solution. V2 = Final volume of new solution.

How long should you leave 40 developer on?

40-volume developer should not be left on your hair for more than 30 minutes. Generally, a processing time of 10–20 minutes is enough to achieve a lift without causing excessive damage. Check the hair frequently to monitor the color lift, and rinse thoroughly when the desired shade is achieved.

Will a 40 volume developer lighten hair by itself?

The short answer is no—developer alone does not lighten hair. It needs to be mixed with a color or bleach to achieve the lightening effect. While 40 volume developer can lighten the hair to a certain degree on its own, it is far more effective when used with bleach.

How long should you leave 30 volume developer on dark hair?

One of the most common questions is: How long to leave 30 volume developer on hair? In general, it's recommended to leave it on for 15–30 minutes, depending on how much lift you're looking for. However, going over this time can cause significant damage.

What developer to use to cover grey hair?

The standard developer for gray coverage is 20 Volume; however, 30 Volume and 40 Volume can also be used if the percentage of gray is low and additional lift is needed to achieve the desired result.

Is a 40 volume developer too strong?

40 volume hair developer

People choose 40 volume because it's strong enough to lighten even the darkest hair. However, it's also very harsh and can damage the hair if used too often. So, it's best that you be cautious here.

Is 30 developer bad for your hair?

If it's virgin you could probably manage a 30 volume, it will do some damage but not as bad as bleach. If you baby it and do a protein treatment after, and maybe add something to the dye like olaplex if you can get it, you'll probably be ok, minus some damage still because all dye does do some damage.

How much hydrogen peroxide is in 40 volume developer?

A: Examples of the Hydrogen Peroxide Content via a 10, 20, 30, 40, and 50 Volume Peroxide is as follows: (Approximately): 10 Volume = 3% Peroxide, 20 Volume = 6 % Peroxide30 Volume = 9 % Peroxide, 40 Volume = 12 % Peroxide and a 50 Volume = 15% Peroxide.

What happens if you put 30% developer in your hair by itself?

But we don't recommend that you apply just developer to the hair. You will get an uncontrolled lift, without any re-coloration and you will end up damaging the hair. Always use developer combined with bleach or color or toner. Never by itself.

Can you use 30 vol for grey coverage?

One of the most common uses for a 30 volume developer is covering grey hair. The strength of the developer allows the dye to fully penetrate the grey hair, ensuring complete coverage.

How many levels does 40 volume developer lift?

40 Volume (12%) Developer

A Volume 40 developer is only used for lightening and can lift up to 8 levels. It is recommended for use with a lightening cream or powder for those who want to achieve blonde results.

Do I shampoo after bleaching?

Once you've rinsed the bleach out with lukewarm water, apply shampoo and wash it the hair thoroughly, but gently. After which a deep conditioner is highly recommended to keep hair from drying out further which may lead to unnecessary breakage.

What happens if you leave developer in your hair too long?

And remember, timing is everything - leaving the developer on for too long can lead to over-processing, while not leaving it on long enough can result in poor color results.

What is the difference between 40 and 30 developer?

40% developer is a very strong lift or intensity for the color , 30% developer is a medium lift for 5 shades and is strong , 20% developer is standard lift and what most people use to dye their hair . 10% developer is lowest strength developer , you use that to tone or just add a slight color difference .

How many levels does 30 volume developer lift?

A 20 Volume developer lifts hair by 1-2 levels, while a 30 Volume developer lifts by 2-3 levels. A 40 Volume developer offers the most significant lift, up to 8 levels, for dramatic color changes.

Should I rinse bleach out of hair with cold or hot water?

Step 7: Wash it

Use lukewarm water, too hot or cold of water can shock your hair in its already fragile state. Make sure to completely rinse out the bleach and gently wash your hair to get out all the product.

How damaging is 40 volume developer?

40-volume developers contain 12% hydrogen peroxide. These lift your hair up at least 8 levels! This developer is not appropriate for at-home use at all, unless you are a hair coloring professional, because this developer can cause serious damage to your scalp and your hair.

Can I use 40 developer on scalp?

The stronger the developer, the more the hair cuticle opens and with a super high level developer, it's way easier to do serious irreversible damage to your hair. Never use 40 volume on your scalp.

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