L`Oreal Oreor 40 Volume Creme Developer 16 oz Beautiful, uniform color Rich, creamy formula Lifting action up to 4 levels For use with lightening productsL` Oreal Oreor 40-Volume Creme Developer mixes easily with chosen hair coloring product to provide permanent color change. Has a very strong lightening action without color deposit. Use 40 Volume for lifting action up to 4 levels or for use with lightening products. The rich, creamy formula gives you easy application and beautiful uniform results every time.