My hair was a darkish brown colour. About 2 and a half months ago I had my hair highlighted professionally which looked great! Naturally, my roots started coming through and I could not afford to go back to the salon. I therefore bought a bleach to do the roots myself. After about 15 minutes I noticed that I had completely over-done it so quickly washed it off. Too late! ALL of my roots and top layer of hair was a bright yellow (In large chunks). I quickly ran to the shop and got a garnier light brown permanent colour and dyed over it. It does not look disastrous but in the light you can see really light roots and darker further down. This was two days ago and I want to colour it again asap but am worried my hair won't cope. I have very fine hair so not sure what will happen. Any advice would be great!