Product Description Blond Studio Nutri-Developer 40-Volume is fully stabilized and buffered to ensure consistent and uniform lightening results. It’s creamy, rich formula encourages gentle controlled lightening action with up to 4+ levels of lift and is not recommended to be used on the scalp. This is the recommended developer for Blond Studio Platinum Plus & Platinium Ammonia-Free. The mixing ratio for Platinium Plus & Platinium Ammonia-Free is dependent on desired consistency. Blond Studio Nutri-Developer ratios are 1:1, 1:2, 1:3. The development time for Platinium Plus & Platinium Ammonia-Free is a maximum of 50 minutes. Once the development time is complete, rinse thoroughly with warm water. Sunkissed Lightening Oil can also be mixed with Blond Studio Nutri-Developer for a thicker formula, if desired. Freehand Techniques Powder can be mixed with Blond Studio Nutri-Developer, however the mixture will be much thicket and may be more difficult to apply.