What type of developer is typically used for covering gray hair effectively?

The type of developer that is typically used for effectively covering gray hair is 20 volume. This developer has a strength that allows for adequate lift and saturation of color to ensure that gray or white hair is thoroughly covered.

20 volume developer contains 6% hydrogen peroxide, which provides enough lift to penetrate the hair shaft and allow the color to bond properly, resulting in a more vibrant and long-lasting color. It is particularly effective for gray hair because it not only deposits color but also opens the cuticle of the hair to ensure better coverage.

While other volumes of developer can be used in different contexts, 10 volume is primarily for deposit-only color, making it less effective for full gray coverage. The higher volumes, such as 30 and 40, are typically utilized for substantial lifting in cases where a lighter shade is desired rather than covering gray hair. This means they may not provide the best results for achieving a natural look on gray hair, as their primary function is to lighten the hair rather than purely deposit color.

Therefore, 20 volume is the optimal choice for covering gray hair effectively, as it strikes a balance between lift and deposit that is crucial for ensuring full coverage and a vibrant finish.