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How to choose your Hydrogen Peroxide strength.

Use 20 Volume (6%) Hydrogen Peroxide:

To dye colours with the same base shade or up to two shades lift in the Natural Base Shade.
Please see the example below:
Natural Base Shade Desired Colour Mix this Hydogen Peroxide strength
2 1, 3, 3.0, 4, 4.0 20 vol 6%
4.3, 4.56, 4.35

Use 30 volume (9%) Hydrogen peroxide:

To dye colours that need 3 shades lift of the Natural Base Shade
Please see the example below:
Natural Base Shade Desired Colour Mix this Hydogen Peroxide strength
2 5, 5.0, 5.12, 3.35, 5.6 20 vol 6%
5.3, 5.52, 5.4, 5.15, 5.32,

For colours that need more than 3 shades lift of the Natural Base Shade you will need to pre bleach the
Natural Base Shade first before applying the hair dye.
Please see the example below:
Natural Base Shade Desired Colour Mix this Hydogen Peroxide strength

2 The full range between
6 to 7 Pre Bleach to 6 or 7 using 20 vol 6%
8 to 10 Pre Bleach to 8,9,10 using 30 vol 9%

Now that you understand Hydrogen Peroxide strengths and how to mix which strength with which hair
dye take the following four pratical tests to confirm you understand all of the above.