L'Oréal Blond Studio Oil-Developer 30 Volume, represented as 9%, is a developer or oxidizing agent used in conjunction with various hair color and lightening products. Here is some information about this specific developer:

"30 Volume" or "9%" indicates the strength and volume of the developer. In this case, it is a relatively strong developer used to lighten the hair. It provides a moderate to high level of lift, typically up to three levels. This strength is often used to lighten dark hair or achieve significant color changes.

It contains certain caring ingredients that can help protect the hair during the lightening or coloring process. These types of developers are formulated to minimize damage and maintain hair health and shine.

To use L'Oréal Blond Studio Oil-Developer 30 Volume, mix it with the corresponding L'Oréal Blond Studio lightening or coloring product, following the recommended mixing ratios and instructions on the product packaging. The specific conditions and treatment times may vary depending on the desired results and the specific technique used.

Professional Use: This product is used by professional hairdressers in salon environments. achieving the best results with developers and lightening products often requires professional expertise. It's important to do a patch test and a beach test before using a hair color product, especially when dealing with stronger developers like 30 Volume. These tests help ensure that you get the desired results and that there are no side effects or unexpected results. Always follow the instructions that come with the product carefully and consult a professional stylist if in doubt or if you have no experience with hair coloring or lightening processes. Correct and safe use of these products is essential to achieving the desired hair color while minimizing the risk of damage to your hair.

The product is professional and therefore at your own risk.