* Developer's primary function is to lighten, not darken. It opens the hair cuticle to allow color molecules to penetrate. Higher volumes like 30 lift more aggressively.
* Darkening hair typically requires a low-volume developer (10 or 20) or a deposit-only color. These are designed to deposit pigment without significantly lifting the existing color.
* Using 30 volume could cause:
* Damage: The strong lifting action can dry out, weaken, and break your hair.
* Unpredictable results: You might end up with uneven color, hot roots (brighter color at the roots), or a brassy tone.
* Color fade: The lifted cuticle won't hold onto the new color as well, leading to faster fading.
Safer alternatives for darkening your hair:
1. Use a demi-permanent color with a low-volume developer (10 or less) or a deposit-only color. These options deposit color without lifting.
2. Consider a color gloss or glaze. These are gentler options that add shine and tone while darkening the hair slightly.
3. Consult a professional colorist. They can assess your hair's condition and recommend the best products and techniques to achieve your desired darker shade without causing damage.
4. Temporary hair color such as tinted wax or hair makeup.
In short, avoid using 30 volume developer to darken your hair. It's not the right tool for the job and can lead to damage and unwanted results.