The special optical brighteners in this rich black shampoo are recommended for all dark colored long and short haired breeds to highlight the coat and leave a shiny finish without softening hair shafts. Contains no dye or harmful chemicals! Use full strength for maximum enhancement of dark coats or to tone down red in "hot" torties. For blacks with no color problem, dilute 4 to 1. NEVER use black shampoo on a white face, especially near tear stains.