Prodigy is L'Oréal Paris' first permanent, ammonia-free hair color, specially designed to give you a natural-looking hair color. Our formula uses oil-based color technology to deliver a new color blend that matches your hair color and provides full gray coverage. Choosing your perfect color: Color results will vary depending on your natural hair color. If you're torn between two shades, choose the lighter one. Color result: On gray hair, the color will appear lighter than on non-gray hair.