Does Hair Developer Expire?

A standard hair developer expires after three years when stored unopened, in optimal conditions, and lasts for six months once opened.

Hair developer goes bad due to the breakdown of their active ingredient, hydrogen peroxide (H2O2), into water (H2O) and oxygen (O2), especially when exposed to light, heat, or certain impurities.

Therefore, manufacturers recommend storing the developer in a cool, dry place away from direct sunlight to maintain its effectiveness.

Change in Consistency: If the nature of your hair developer was creamy and the consistency is not creamy right now, avoid this developer because it has probably degraded already.

How to Tell if a Developer is Expired?

If you observe a yellowish color, then that developer has been exposed to heat, and it is not suitable for use.

Change in Color:

If the hair developer smells differently than it did when you first opened it, this could be a sign that it has expired.

Change in Smell:

Swelling in the Container:

Swelling indicates that a chemical reaction is occurring inside the container, which means that the hydrogen peroxide is breaking down faster.

If you see all or one of these signs, throw the developer away immediately.

Swipe up to learn how to store hair developer correctly!