A visual guide typically displays a grid or table format, illustrating the relationships between underlying pigment, desired hair color, and the appropriate filler shade. For example, someone with very light blonde hair who wants a deep, vibrant red might need a gold or copper filler to prevent the red from appearing washed out or brassy. The guide helps colorists select a pre-color treatment that deposits the necessary underlying pigment to achieve optimal color results.
Utilizing such a guide is crucial for achieving predictable and vibrant hair color outcomes. It helps prevent unwanted tones, color fading, and uneven results, particularly when transitioning between significantly different shades or covering gray hair. Historically, colorists relied on experience and intuition to formulate filler mixtures. These visual aids provide a more standardized and reliable approach, benefiting both experienced professionals and those newer to the field.