It's oxidizing on you. Have some tips, via Wayne Goss... [VIDEO]http://www.youtube.com/watch?v=sYVyQ24xpCo[/VIDEO] Some people suggest going a shade lighter (in your case, you'd go up to NW10 or NW13 in the same foundation), but I'm not so sure I agree with that, personally. If nothing works and it still oxidizes on you, SFF isn't the right foundation for you, and you need to try a different one. If you want to try a different MAC foundation, keep in mind that NW15 may not match you in other formulations, and there are at least two that don't have an NW15 shade (Pro Longwear and Full Coverage). Having a foundation oxidize orange is a pain in the arse. That's happened to me before. I eventually worked out that I can't wear foundations with a matte finish because of it (Revlon Colorstay in its Combination/Oily formula, as well as MUFE Mat Velvet+, oxidized on me). Studio Fix Fluid would fit into that category.
