So I dyed my hair about two/three weeks ago with a boxed dye (garnier olia). It looks fine, but I’ve been a redhead for about three months now and I’m just tired of it. I want to go back to a dark brown. Is it safe to go ahead and re-color it now? I figure I’ll probably be okay if I get a semi/demi-permanent color with no ammonia, since I’m going darker, not lighter, but I wanted to ask just in case anyone here has some information or experience that would be relevant. Thanks!