ريدكن

No, and they're not competing. A salon treatment is a one-off intervention; the Acidic Bonding system is the maintenance that stops the result unravelling over the following weeks.

Usually not. Violet pigment builds up on very light blonde and can read dull or grey. Most people alternate it with All Soft or Acidic Color Gloss and use the purple once or twice a week.

Different chemistry aimed at the same problem. Olaplex is the more targeted bond repair; Redken's acidic system is easier to run as a complete routine because the shampoo, conditioner and leave-in are all designed together. If you already own Olaplex, the Redken leave-in still layers on top fine.

Los Angeles. Founded in 1960 and part of L'Oréal's professional division since 1993.