Hair Bleach & Developer Mixing Ratio
Calculate the precise amount of developer to mix with bleach powder for safe hair lightening, with volume-based processing time guidance.
Results
What is it?
Hair bleach (lightener powder) must be mixed with a hydrogen peroxide developer at the correct ratio to achieve safe and effective hair lightening. The volume of developer determines how many levels of lift you achieve, and the ratio controls consistency.
How to use
Weigh your bleach powder, select the mixing ratio appropriate for your application, and choose the developer volume based on how many levels of lift you need. Always mix by weight for accuracy. Apply immediately and monitor continuously.
Example scenario
For highlights on dark hair: 30 g bleach powder + 1:2 ratio = 60 g of 30 Vol developer = 90 g total mix. Maximum processing time: 45 minutes. Check every 10 minutes to avoid over-processing.
Pro tip
Never exceed 45 minutes of processing time regardless of volume. Use a lower volume developer (20 Vol) for multiple sessions to minimise damage. Always perform a strand test 48 hours before full application.