Blond Studio 9 Oil Developer 20 and 30 Volume is oil-enriched to enhance the overall performance of the 9-level lightener.What it does: The oil is responsible for boosting the lift and keeping the lightener result predictable. It is our way to achieve up to 9 levels of lift, quicker, with lower volume developers.What else you need to know: The oil-base in the developer also offers optimal mixing and application due to its creamy consistency.

L’Oréal Professionel Blond Studio Oil Developer - 33.8 oz - 30 Volume