This designation represents a selected shade inside knowledgeable hair coloring system. Typically, the primary quantity (7) signifies the extent, referring to the lightness or darkness of the colour, with 1 being the darkest (black) and 10 the lightest (platinum). The quantity following the decimal (1) signifies the tone, reflecting the nuance or hue inside that stage, reminiscent of ash, gold, or copper. This exact numerical system permits for constant and predictable colour outcomes.
Standardized colour numbering programs present a common language for hair professionals, enabling clear communication and correct replication of desired shades. This precision eliminates ambiguity and guesswork, contributing to consumer satisfaction {and professional} effectivity. The event and adoption of such programs replicate the evolution of the hair coloring trade in the direction of higher sophistication and technical mastery. Understanding this technique permits for knowledgeable decisions concerning colour choice and upkeep.