Pleasant perfume. Bright Shades with no ammonia or peroxide. Supersonic colour can be re-applied to intensify colour. Colours can be mixed to create new shades. No developer is required and it is easy to apply. Colours can last 4-5 washes (timing colour for 15 minutes), often longer depending on aftercare, intensity and base colour. Timing colour for longer periods of time will result in your colours lasting much longer.