Pro-Oxide Developer 40

It is not recommended to continue using developer if the cap has been removed or lost. Without a cap, not only can the strength (active levels of H2O2) degrade, but the formula itself can be affected by contaminants.

If you have product that has frozen, allow to fully thaw at room temperature. Do not heat to thaw. When dispensing from tube or bottle inspect for any visible product separation. If no separation is present, you can proceed with applying the product.

Yes, Pro-oxide Cream Developers can be mixed together. Though it’s not an exact science, the best ways to confirm that you are getting the true strength desired (for example, mixing 10 volume and 20 volume in equal parts to get 15 volume) is to precisely use a measuring cup or a scale. If not, it could be difficult to re-create the exact volume used for your client’s next visit. Depending on the age or active levels of H2O2 of each component, there could be variability in the mixture.

It’s not recommended to do so since different developers contain different ingredients, such as conditioning agents. When used as directed, Redken Pro-oxide Cream Developers work synergistically with Redken permanent hair colors and lighteners to provide the ideal consistency, level of lift, conditioning, and expected performance. If using another developer, these benefits could be compromised.