I was beginning to think there was no way to get the Atomic Pink out of my hair too. I put blue over it and within three weeks it was bright purple/pink. It's been since last October and I still have traces of pink in my head. It's crazy!
This is currently me too, It seems I'm stuck with the pink undertones, because my hair seriously can't take another bleaching I was SO brutal with the bleaching trying to get the dammed pink stuff out. I colour B4'd it, then bleached it with I think 30 vol, then tried to k-pac'd the life back into it, and bleached it again 3 weeks later but am still stuck with a dirty picture 2 pink under the blue (Blue mayhem), that starts coming through in just 2 washes and fairly weak hair :/