When toi dye your hair do toi have to use a certain kind of shampoo to wash it and be able to keep it?

It's best to use a shampoo and conditioner meant for colored hair. Also, if your have unnatural color in your hair, that tends to fade faster than natural colors, so it's best if toi don't shampoo every day, though it's recommended par many that toi still condition every jour and deep condition on days that toi do shampoo. Also, if toi did the dying yourself, if toi have any dye left, toi might think about mixing some of it with a smaller bottle of conditioner and using that on the strands toi dyed blue.