What process is often used to provide a base for applying permanent hair color?

The process referred to as double processing is commonly utilized to prepare the hair for the application of permanent hair color, especially when a significant color change is desired. This technique typically involves two key steps: first, the hair is lightened using a bleaching agent, followed by the application of the permanent color. The primary goal is to create a foundation that allows the desired hair color to develop vibrantly and accurately.

Double processing is particularly important for achieving lighter or more dramatic hues on darker hair, as it helps to lift the natural pigment before depositing the new color. This method ensures better color accuracy, longevity, and the desired end result, which is essential for effective hair coloring.

In contrast, other processes like bleaching, highlighting, and glazing serve different functions. Bleaching is primarily focused on lightening the hair but does not inherently involve the subsequent step of applying a color. Highlighting involves selectively lightening strands of hair, which doesn’t provide a uniform base color necessary for a comprehensive application of permanent color. Glazing is primarily used to enhance or refresh the existing color rather than create a foundational base for a new color.