Now you might be wondering that since this product is a shampoo, how permanent are the colour results? The answer to that well-thought question is VERY permanent. This is because although this product is a shampoo, in reality, it's both a shampoo and a hair dye. So, in essence, you get to have your hair coloured while having your bath. The colouring effect is also long-lasting, which means it won't just wash off the next time your hair comes in contact with water.