About a month ago, I dyed my hair natural black with dye that I bought from a cheap supermarket. My roots have grown in quite a bit, and I decided I was done with black, and I wanted a new look. So I got this new shade that's kind of copper-y brown-ish. My natural hair colour is dark brown. I dyed my whole hair, but the dye only worked on my roots, and the rest of my hair is still black. It looks awful, and I don't know how to fix it. Can anybody help?