A powerful five-minute reconstructor that rebuilds and strengthens stressed, physically and/or chemically treated hair. Lost or depleted amino acids are replenished with a high concentration of Quadramine Complex for maximum reconstruction and protection from the cuticle to the cortex. With the use of Joico K-Pak Deep-Penetrating Reconstructor for Damaged Hair, weak and damaged hair is restored to its original strength and condition, helping to prevent colour loss and making your hair more responsive to styling. pH 4.5-5.5. Directions: Joico K-Pak Deep-Penetrating Reconstructor for Damaged Hair works best when: - Applied to clean, damp hair.