Galloping Goop Hi Ho Silver Toning Shampoo contains optical brighteners and is specifically formulated to restore the luster and shine of white coats. It’s a deep purple, allowing you to see exactly where you work it into the coat. Then rinse off until the water runs clear, revealing a smooth bright shine. See the difference it makes for your white horse today! The gallon is the way to go for your wash station and many groomings.