Hi all! I didn't see much on this topic, so I thought I would start a new thread on it. I have been having issues lately (okay, not just lately...) with foundation oxidizing and turning darker on my face. Bare Minerals has always done it on me (both the regular and the matte) as well as other powder foundations such as Pur Minerals and Palladio, and lately I've noticed that Revlon Colorstay for combo/oily skin is doing it too. Is there a way to prevent this or do I have to just keep trying new foundations until I find one that doesn't oxidize? They always end up turning a darker, orangier color with an obvious makeup line along my jaw/neck - which is one of my very biggest pet peeves. Thanks much for any advice!