I have a 3/4 wig in colour #4, bought it years ago but never worn because I went blonde. I got it from annabelles wigs. My hair is currently back to brown so i might aswel use it! (went from blonde to brown using goldwell 6G so it went more a 6N) has now faded to an ashy 7. What colour should I put on to match my hair piece? I was thinking either 6G or 6B? Or is colour #4 more a level 5?