Can someone please explain what is meant by the term MSF? It is something that I want to try because I always hear the positive reviews about it, but I really don't know what it stands for. Thanks!

Mineralize Skinfinish... there were 18 released in various collections.

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It's Mineralize Skinfinish

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There a A LOT of threads about MSFs. Here is one in the FAQ thread:

Mineralize Skin Finish - basic facts

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Thanks guys. However, the topic that you recommended has me even more confused. Exactly what are they used for? Are they used as a foundation or more-so as a bronzer?

MSF Natural-boring skin toned ones. LOL I use these to set my liquid foundation. Just a few swipes on it with a powder brush, over my face after I've applied foundation, then I put on blush etc.
MSFs-the coloured/possibly glittery ones. These I use primarily either as a blush or over my blush. Or just wherever I want some highlighting on my face/body. I know the MA who was explaining them to me last year told me about how you could swipe it on your décolletage to be all shimmery when you go out.

I don't think these (correct me if I'm wrong) would be good as a bronzer. A lot of times with the highlighting factor and possibly glitter if you try using it as a bronzer you may look either greasy or like a disco ball. Or both.

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Like their names imply, they are meant to give a certain glowy finish to the skin. Many people like to use them as highlights on various parts of the face and body.

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Do they still sell these? I was at the Nordie's MAC counter and didn't see any of them...only the natural ones and they weren't appealing. I want something that is similar to the Radiances that Bare Escentuals offers?

Right now there are duo's natural/shimmer, and the totally natural ones
M·A·C Cosmetics | Mineralize Skinfinish (Duo)

M·A·C Cosmetics | Mineralize Skinfinish/Natural

Next month however some of the other's are set to be re-released, you can look in the color collections to see which.
But those will be the shimmery ones that you are looking for

here are the links
MAC - Mineral Line Expansion and Displayer - Oct 08

MAC - Sheer Minerals Collection - Oct 08

I actually do use mine as foundation...

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