What volume developer is included?

A 35-vol developer is included. This volume of this developer is not recommended for on-scalp application. If you do decide to apply the bleach at the scalp, be extra cautious and aware of any pain or itchiness you may be experiencing, and wash the bleach out immediately if you’re experiencing any pain, redness, or irritation. The ingredients in this developer are meant to help minimize any possible damage but it is still a chemical and should be regarded as such. Meaning, keep bleach off skin and clothes and make sure you are mixing and applying in a well-ventilated area!