These numerical designations within the hair coloring system represent specific shades within a manufacturer’s palette. Typically, the number “27” denotes a medium blonde with violet undertones, contributing an ash or cool tone to the resulting color. “30” generally indicates a light golden blonde shade, offering a warmer, more traditional blonde appearance. The nuances of these tones can vary slightly depending on the brand.
Selecting a precise shade like a medium blonde with violet or a light golden blonde allows for a high degree of control over the final hair color. This level of specificity is crucial for achieving a desired look, whether it’s neutralizing unwanted brassiness, creating a natural-looking blonde, or matching a previous color. The availability of such granular color options provides both professional stylists and individuals with the tools to achieve targeted color outcomes. Historically, achieving such specific tones required complex mixing and formulation, but standardized numerical systems have simplified the process.