Mine are purple and I can't see any stains after 2-3 weeks of barrier cream use.
On occasion I have also used Lansinoh on his bottom. I figured that if it's good for sore and cracked nipples, why not for a sore bum. It seems to be good.
The good news is that the rash seems to finally be clearing up - yay! I felt so sorry for my poor wee man.

Sasa