What does the second letter or number indicate in hair color formulation?

In hair color formulation, the second letter or number is indicative of the higher pigment concentration. This detail plays a critical role in achieving the desired shade and intensity in the final color result. When a hair color formulation includes this second designation, it typically points to a more pronounced or intensified shade that can influence how the color interacts with the natural hair tones.

For instance, in professional hair coloring systems, numbers that follow the primary shade can specify variations in pigment density, allowing the stylist to select a product that will deliver the expected level of vibrancy or depth. Understanding this aspect helps colorists tailor the color more precisely according to the client's needs, ensuring optimal results in terms of coverage and coloration.