I went back and looked at my picture -- I can see that shimmery edge -- don't remember seeing that in person. Yes -- a wire edge is the thinnest possible line along the outer edges of the falls or standards, or both. It's generally a contrasting color though -- not shimmery. I don't think?
Lucy -- once again you educate us -- I didn't know why it was a different color! Does that hold true if it's a darker color line?