Bleached hair, can i go dark again!!!

If your highlights are really light say yellowish you need a filler.You have to replace your natural undertones back in say a red filler than use a brown hairdye.

More than likely your hair (may) have a green muddy ashy cast if you use a ash brown without adding a red filler.

 If your hair is naturaly dark brown use medium brown. If your naturaly light brown use light brown, just becareful though because your highlights may be pourous and it will suck up the hairdye like a sponge. So keep checking it .Don't go by the recommended time you don't want to go to dark.Medium brown once turned my hair BLACK!!   I left it on the recommend time and it was really dark!! I should've done a strand test.