Red Seal Hairstylist Practice Exam

Double processing in hair coloring is a technique that involves lightening the hair and then applying a color, which is particularly useful for achieving dramatic changes in shade. This method is commonly employed when transforming dark hair to a significantly lighter or vibrant color, as it allows the hair to reach the desired level of lightness before the toner or final color is applied. This two-step process is crucial for ensuring the final color appears bright, true to the desired shade, and vibrant, particularly when working with pastel or vivid hues.

Using two different colors simultaneously pertains more to techniques like balayage or ombré, while applying a toner before the color often involves a single processing step rather than the two distinct actions that define double processing. Layering hair color with stains describes a different method that does not correspond to the principles of double processing. Thus, choosing the option that highlights the sequential process of lightening followed by coloring accurately encapsulates what double processing entails.