Hair developer level refers to its oxidizing potential. The
majority of hair color formulas work with a volume developer at
level 10, 20, 30 or 40.
The 10 volume developer is a standard oxidizing level for
permanent, no-lift hair color. It's designed for use when you want
to add a color tone or tint to the hair of the same lightness
level. It also opens the hair cuticle layer, allowing the color
molecules to penetrate and deposit in the cortex.
The 20 volume developer opens the hair cuticle but unlike 10
volume, it provides lifting of the hair by one to two levels. For
instance, if you have more than 50% gray hair, 20 volume developer
is the only developer to use for 100% gray coverage and a
long-lasting color.
The 30 volume developer also works like 20 volume, but it will
lighten the hair's original color by two to three and is more
efficient when the desired color is no more than two levels lighter
than the original color. Choose a 30 volume developer when you want
a developer that is stronger for a lighter and deeper color.
The 40 volume developer is the strongest and has the potential to
produce significant changes. It will lift your hair four shades and
is suitable for blondes, especially high-lift colors. You can use
40 volume developer when you want to achieve a medium to dark
blonde. You can also use it with bleach for better results.
However, use it carefully to avoid adverse effects that may arise
due to its strength.
WARINING
It contains hydrogen peroxide. Avoid contact with eyes. In case of
accidental contact with eyes,rinse out immediately with plenty of
water and seek medical advice.Wear disposable gloves.Keep out of
reach of children.Do not expose to sun’s rays.Store in a cool
place.FOR PROFESSIONAL USE.