+22 What Do The Numbers Mean On Hair Color 2023. Let’s first take a look at the hair dye numbering system and the numerals you should understand. The first number of a hair colour represents the lightness of the shade, measured from 1 (darkest) to 10 (lightest).

1.0 is black, 5.0 is light brown, 6.0 is dark blonde, 7.0 is medium blonde and 10 is the lightest. Additionally, some hair dye brands use letters to name the tones easily. Web the haircolour levels range from 1 (black) to 11 (very light ash blonde).