Will Just 30 Developer Lighten Hair?
It is unlikely that Just 30 developer alone will significantly lighten hair. Developer is a peroxide-based solution that is used to activate bleach or hair color and works in combination with those products. However, using developer alone without bleach or hair color can still slightly lighten the hair, but the result may be uneven and not as dramatic as using it with bleach or hair color. It is best to consult with a professional stylist before attempting to lighten hair at home.