What is the difference between single-process and double-process hair color?

The distinction between single-process and double-process hair color lies in the number of applications used and the end results they achieve.

Single-process hair color involves a single application of hair dye to change the color of the hair. This method is typically used for achieving a uniform color, either by going darker or applying a similar shade. The simplicity of this process makes it a popular choice for clients looking for a quick and efficient way to color their hair.

On the other hand, double-process hair color requires two separate applications. This technique is often utilized to achieve a more complex color change, such as lightening the hair and then applying a new color. The first application usually involves a lightening product which prepares the hair for the second application of color. This method is essential for achieving vibrant, fashion colors or for lifting hair to a lighter shade before applying a different tone.

Understanding this distinction helps hair designers choose the appropriate technique based on the client's desired outcome, hair condition, and color goals.