The ratio of 40 volume creme developer to permanent hair color is typically 1:1. This means you would use the same amount of developer as you do hair color. For example, if you mix 2 ounces of hair color, you would also use 2 ounces of 40 volume creme developer.
Mixing a 30 volume creme developer with a 40 volume creme developer is not recommended as it can alter the desired outcome of your hair color process. The resulting mixture may have an unpredictable volume, potentially causing damage to your hair and scalp. It's best to stick to the developer recommended for your hair coloring product for best results.
When used alone, developer will do nothing to the hair. It is made to be mixed with a hair color.
I would say it depends on your hair type and what kind of developer you used
20 vol
darker!
You have to have a actuall hair color to mix with it. Use 2oz of the color and 4oz of the developer and mix. And apply to your hair
Mixing 20 volume creme developer with 30 volume creme developer will result in an in-between strength, usually around 25 volume. This may alter the expected outcome of your hair color or chemical process, so it's best to use the correct developer strength recommended for your specific hair product.
Mixing a 20 volume creme developer with a dye that already contains developer may result in an overly strong developer concentration, which can be damaging to your hair. It's generally recommended to use developer specific to the dye you're using to ensure proper color development and hair health.
Mixing equal parts of 20 V. and 40 V. developers will give you an approximate 30 volume developer.
Developer is used with professional color to adjust level of color desired. For example, black hair could be described as level 1, adding blonde highlights would require a 40 volume developer to lift the color of your hair 4 shade levels.
Mixing 20 volume creme developer with 40 volume creme developer can result in an intermediate strength developer solution, depending on the ratio of each. However, it is not recommended to mix different volume developers as it may alter the desired results and could potentially be harmful to the hair. It's best to use the developer strength recommended for the specific hair coloring product being used.