Achieve the perfect blonde hair color with ! This bleach kit contains Premium Lightener 9+ and Developer 9%. The bleach powder has a 1:1 ratio, meaning you don't need to use any additional developers. For light to medium blondes, we recommend using 20 volume. For medium to thick hair, use 30 volume. Please note that this is not a bleach for dark hair. To ensure the best results, we recommend following our online instruction video. This is a professional product and should only be used by trained professionals. Do not use if you have a rash on your scalp, or if you have recently relaxed your hair. If you are pregnant or breastfeeding, please consult with a doctor before use.