Hair color chart numbers are standardized numerical codes used to define and categorize different hair colors and shades. For example, a hair color chart number of "6.0" represents a natural dark blonde shade.
Hair color charts are essential tools for hair stylists and colorists, as they provide a universal reference for describing and matching hair colors. This ensures that clients and professionals are on the same page when discussing desired hair transformations. The development of standardized hair color charts in the early 1900s revolutionized the hair industry, enabling professionals to accurately communicate about and achieve specific hair color results.