The Blacklight 40 volume Smart Developer must be mixed with a Blacklight Lightener or Powershade. It is specially formulated to provide prefect consistency of final mix, to deliver optimal lifting and to facilitate application. The Blacklight developers ensure consistent and reliable results with each application. Each Blacklight developer is enriched with gradual bond protection technology; this technology strengthens hair bonds and protects the surface of the hair during chemical treatments. It also replenishes and prevents the loss of natural lipids in the hair. The protection level varies depending on the concentration of hydrogen peroxide present; as it increases, the built in protection also intensifies.