Blond Studio 9 Lightening Powder must be partnered with the L'Oréal Professionnel dedicated foils for all enclosed techniques. L'Oréal Professionnel dedicated foils are created with an Aluminum Purity which allows the lightening mixture to quickly and evenly lift the hair while Traditional foils are built to trap in heat which could react negatively with the lightening mixture.
Blond Studio 9 is optimized to be partnered with the L'Oréal Professionnel dedicated foils. Without the use of these dedicated foils for enclosed techniques, we cannot verify the quality of the results.