On what scale are the levels of hair color typically categorized?

Hair color is generally categorized on a scale from 1 to 10. This numbering system allows for a clear differentiation of the darkness or lightness of hair colors, with 1 representing the darkest level (black) and 10 indicating the lightest (lightest blonde). The scale helps professionals communicate specific hair color shades effectively, whether they are selecting a hair dye or consulting with a client about desired hair color results.

While scales with fewer levels, such as 1 to 5 or 1 to 7, may exist, they do not provide the same range of color variations and nuances that a 1 to 10 scale offers. A scale extending to 12 also goes beyond the standard used in most applications and can create confusion without adding significant benefit. Thus, the 1 to 10 scale is widely accepted and utilized in the beauty industry for its comprehensiveness and clarity.