So, I dyed it blonde on 8/14 and kept it in pretty good shape, but got tired of it (it had been blonde for a year by then). So then I got it cut by like, 2 inches and went black. It turned out blue because my hair was so light. I want to cover the faded blue with black, its been about 18 days since I last tried to color it. How soon can I try dying it again without damaging my hair? Also, I use decent conditioner because it's naturally curly and frizzy, so it feels and looks pretty healthy.