Random rogaine question:

I just switched to foam (BEST DECISION EVER -- I got a 6 month supply from ebay for $50) and I'm trying to decide what to do w/r/t my hair colour. I'm finally starting to feel comfortable with my hair thickness (6ish months post-treatment w/ propecia and rogaine) and seeing good results. Finally bleached / toned my hair to nearly white but I really want to go pink (again). I looove doing my hair bright colours. The problem is, all the "interesting" colours (read: pink) are semi-permanent. Will rogaine cause it to fade faster where I apply it? That would look very, very odd. It's pretty chemical-y smelling so I'm really concerned about that it'd dissolve the pink (or any other semi-permanent dye) and leave me with a blonde top and pink sides/back hahaha. Soooo..any thoughts?