I've always had trouble determining whether my skin tone leans toward warm or cool because it seems like I can pass and fail all the tests:
My veins are neither green nor blue; they're purple!
I can wear either gold [warm tones] or silver jewelry [cool tones]
My hair is medium chestnut brown [warm or cool]
My eyes are brown with grey around the iris [warm or cool]
I can wear greys, whites, blacks and jewel tones [cool]
I can also wear earthtones and rich autumn neutrals [warm]
Do you see my confusion?
MAC mineralize satin finish - NW25, but still too yellow for me. Good thing I don't wear MAC foundation!
NCN liquid mineral foundation - light/med. with pink undertones - nearly a perfect match, but coverage is sheer enough that it doesn't have to be.
I mix up 3 different powders from Everyday Minerals to come up with a perfect shade for me - 2 parts med. beige, one part light winged butter and one part fairly light. I add a little more med. beige during the summer.
I think I must be a neutral but have never had anyone tell me and I really don't trust a MAC MA to tell me since she got it so wrong the last time I tried.