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  • How are reviewers describing this item?
    great, dark, color, blue and done.
  • Our engine has detected that Amazon has altered, modified or removed reviews from this listing. We approximate total reviews altered up to 105.
  • Our engine has profiled the reviewer patterns and has determined that there may be deception involved.
  • Our engine has determined that the review content quality is low.
  • Our engine has analyzed and discovered that 66.7% of the reviews are reliable.
  • This product had a total of 24 reviews as of our last analysis date on Mar 12 2020.


Most positive reviewquestion

I bleach my hair at home and got this to help lift my hair a couple levels fairly quickly. It's a potent developer so I watch i...  Read More

Least positive reviewquestion

Not enough review data to provide meaningful insight.

Most authentic reviewquestion

This 40 developer is AMAZING!!! Strongest results I've ever seen and does not damage hair. Just be sure to use conditioner when...  Read More

Least authentic reviewquestion

Worked great with the L'Oreal Quick Blue powder bleach I bought! My hair went from bright green to light blonde in one application.

Helpful Insights


    Posted by a reviewer on Amazon

    I got the blonde color i wanted and it didn't fry my hair

    Posted by a reviewer on Amazon

    You shouldn't leave in 40 developer too long though.

Review Count History
Price History