Quote Originally Posted by KimFella View Post
...Most transfers you can see a faint clear border around the design, and if you pick at it (the border, not the design) with your thumbnail you can chip off a piece....
I take it back. I just happened to look at another mug that has to have had a decal and I can't see any sign of the clear border.

I'll have to ask my wife, as she did some coffee mugs a while back with decals, and I'm pretty sure she applied the decal over the raw glaze colours on the bisque fired mugs and then went on to the glaze firing. That would burn off any plastic/gel/whatever-the-decal-backing-is, leaving only the design.