Wella Professionals Koleston Perfect permanent hair color in the shade 66/55 Intense Dark Blonde Mahogany delivers long-lasting, professional color results. This 60 ml permanent hair color offers a rich, multidimensional dark blonde tone with mahogany undertones, suitable for natural depth and warmth. Formulated with professional color technology, it provides reliable gray coverage while caring for the hair with nourishing components. The ammonia-based formula ensures consistent, predictable color development and excellent color retention over time. Application requires mixing with the appropriate developer according to professional guidelines for optimal results. This shade works effectively on natural hair levels from light to medium brown bases, creating multidimensional color with subtle red-violet reflections. The product is designed for trained professionals or experienced users with knowledge of permanent hair coloring techniques. The packaging includes precise measurement indicators for accurate mixing ratios. Color results may vary depending on individual hair structure, porosity, and existing color. Conduct a strand test 48 hours before full application to check color results and hair compatibility. Store in a cool, dry place, and protect from direct sunlight. Contains ingredients that may cause allergic reactions in sensitive individuals; check the ingredient list before use. The compact 60 ml size is sufficient for standard hair coloring applications. Wella Professionals is known for salon-quality hair color products developed through extensive research and testing.