Hair colors on the Clairol Professional Soy4Plex color chart are listed left to right, from neutral blond to intense red violet. They are arranged in columns, with the lightest colors at the top and the darkest colors at the bottom.
In order to accurately read a Soy4Plex color chart, it's important to understand the concept of depth. The term "depth" refers the lightness or darkness of a particular shade, and hair colors on the Soy4Plex color chart are assigned a number between 1 and 12 based on their depth. The lightest colors have a depth level of 12, while the color black has a depth of 1.