It took three long years of development, but the response to Mahogany Gold Shampoo made it worth all of the time and effort. We think this is the most effective shampoo on the market to warm and tone the full spectrum of red-based colors from rich browns to the light apricots. We started with the same fine optical brighteners as the other Jerob Color Enhancing Shampoos, then added the ingredients in this new product that were especially formulated to enhance the red tones.