Just For Men Shampoo-In Hair Color in Dark Brown (H-45) is a specially formulated men's hair coloring product that provides natural-looking coverage in an easy-to-use shampoo format. The product restores original color while nourishing hair with biotin, olive oil, and vitamin E. Key features: • Easy shampoo-in application • Restores natural-looking dark brown color • Professional salon-quality results • Contains biotin, olive oil and vitamin E • 100% gray coverage • Single application system • Ammonia-free formula The product comes in a complete kit with everything needed for one application. The shampoo-in formula is designed to work gradually and naturally, targeting gray hairs while leaving other hair untouched. For best results, a patch test should be performed 48 hours before application. The color typically lasts up to 8 weeks with proper hair care maintenance.