Grey Cover

I have been using this for about 4 years after I had a sudden very bad allergic reaction to a permanent Hair colourant. I chose it because it uses no ammonia or hydrogen peroxide or parabens. I find it very good. I always wash my hair first and let it dry. Then apply the colourant quite thickly and don't use any heat but leave it on for up to 2.5 hours. When I come to rinse it out, as soon as the water is more or less clear, I towel dry my hair, Comb gently out while hair is wet and leave to dry naturally. The longer the dye is in contact with my hair the deeper the colour. I find that after one application the colour lasts for about 3.5 weeks or sometimes longer. Although I have long hair, I find one little bottle will do me for 3 or 4 applications. The bottle has to be squeezed hard to get the dye out which is tiring on the fingers as the plastic is very thick. That's my only complaint.
I wash my hair once a week and then I use a conditioner.