Hi, I have a client next week with natural level 5-6 and highlights with bleach and wella 12/89. Looks great but now really want to put some natural depth through when I do the regrowth. I have some c t plus 66/07 so has anyone used this over the top of bleach and high lift ? I was wanting to apply the foils and put 66/07 in between. Any suggestions. Thanks in advance