Hair color levels 1-10 chart: A systematic guide that classifies hair colors based on their darkness, ranging from black (level 1) to lightest blonde (level 10). An example is a swatch card used by hair professionals to match and select hair dyes and toners.
This chart is crucial for colorists as it allows them to accurately determine the natural hair color and predict the outcome of various hair color treatments. It simplifies communication between hairdressers and clients and ensures precise color selection. The development of hair color level systems can be traced back to the early 20th century, with the invention of the first permanent hair dye.