I'm planning to color my hair ash blonde and then add platinum highlights the same week. According to the directions on the highlighting kit, I'm supposed to shampoo the stuff out. Would that strip my newly-colored ash blonde? And if you have any advice on how many days I should wait to highlight after applying the full-head color, please let me know. Thanks!

P.S. I've colored my hair hundreds of times before, so I am an expert in that field. Highlighting will be new to me, but I'm willing to learn through trial and error, so please don't suggest going to get it professionally done. I'd rather learn to do it myself! Thanks everyone