browsing in the Material Room, the edge blend is used pretty often.

how can I put it to work for me? 

Does it blend the edges between 2 material groups?

so, if i wanted to blend for example, between the lips outline or eyeshadow makeup and the rest of the Skin texture,
would this be an application for the node?

Thanks. 
getting ready for a 3 day weekend of beer and poser.

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