What is the purpose of using a clarifying shampoo before a color treatment?

Using a clarifying shampoo before a color treatment serves the crucial function of stripping the hair of previous products and residue. Over time, hair may accumulate build-up from styling products, oils, and shampoos. This build-up can create a barrier that inhibits the hair from evenly absorbing the color treatment. By using a clarifying shampoo, you effectively cleanse the hair, removing these residues and preparing it for optimal color application. This ensures that the color is more vibrant and adheres better to the hair strands, leading to a more uniform and long-lasting result.

The other options, while they may offer benefits for hair care, do not specifically pertain to the preparation required before a color treatment. For instance, adding shine or conditioning the hair is beneficial, but they are not the primary goal when preparing the hair for color. Similarly, increasing moisture is important for overall hair health but does not have a direct impact on the dyeing process itself.