Which term describes hair color shades containing no red or gold, also known as dull?

The term that describes hair color shades containing no red or gold, also referred to as dull, is "drab." In the context of hair coloring, drab tones are specifically formulated to neutralize and eliminate unwanted warmth. This is particularly useful when trying to achieve cooler shades, such as ash blondes or browns, which benefit from a reduction in the warmer undertones of red and gold.

Using drab colors can help create more muted, sophisticated looks, catering to clients who prefer subtler hair colors. This differs from other terms in the list, such as filler, which is meant to restore the base pigment to hair before color application, drabber, which is a comparative term that may refer to something less vivid, and double process, which pertains to a coloring method involving two distinct steps to achieve a desired result. Understanding these nuances is essential for effective color formulation and achieving the desired outcomes in hair coloring services.