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6 years ago
  1. ### WARNING ###
  2. 40 volume bleach can damage all but the darkest, strongest hair.
  3. It is highly recommended you test this before use.
  4. 40 volume ratio:
  5. 1.34oz powder
  6. 4oz developer
  7. bleach 30 min
  8. two applications for dark hair,
  9. with a single application of 20 volume developer and toner to reduce yellow/brass colours.