Paul Mitchell 10 Vol. Cream Developer 3% helps you achieve vibrant, long-lasting results using hair color or bleach. This professional-grade hair product is designed to activate hair color or bleach and help it penetrate the hair shaft for optimal results. The cream-based formula provides smooth and even coverage, making it an ideal choice for use with Paul Mitchell's hair color line. With a strength of 3% hydrogen peroxide, this developer is powerful enough to lighten dark hair or achieve a very light blonde result. However, it should be used with caution to avoid hair damage. The 33.8 oz (1 liter) bottle is a generous size and is intended for use by licensed cosmetologists. Ingredients include Cetearyl Alcohol, Lanolin Alcohol, Sodium Lauryl Sulfate, Salicylic Acid, and Phosphoric Acid. The active ingredient is 3% hydrogen peroxide. This product comes in creams form. Meant for unisex use. To use mix developer and with desired amount of hair color or bleach according to directions. Note that the amount of developer used and the processing time will depend on the hair color or lightening product being used and the desired level of lightening or color. Always follow the manufacturer's instructions and perform a patch test prior to use to avoid any adverse reactions.