I have a bit of grey coming in at the front of my hair and a couple of random streaks starting to appear, towards the back of my head. I'm dark and I'm finding it had to find a true match. It seems to look red over the grey bits and fade to an orangey colour. I don't want to dye the rest of my hair as I am sick of wrecking it, I just want to cover grey bits. Any recommendations on hair dye? Something I can also buy in the US. Thanks 