What do you use? I started by using a non permanent dye, just to get rid of my greys. I don't want to change my hair colour. I am naturally very dark and want to remain that way. After a bit, I progressed to so called permanent dyes but the one I use just does not dye my hair permanently. If it did, I would have roots to retouch every so often, wouldn't I? Instead, I find that after about 6 weeks, all my greys reappear, and not just at the roots but throughout my hair. Plus, once they start to reappear, they do so quite quickly, say within one or two washes which suggests that the dye is simply being washed out. Can anyone recommend a dye that really does stay in permanently and that only requires you to retouch the roots every few weeks. If it is particularly good for dark hair, so much the better.