My senior prom picture stuck and my daughter carefully took a drop of water on her finger tip and touched the back of the picture and let it set a bit, then she carefully took a razor blade and from under the front of the picture she picked it gently away from the glass. I had several place the heat made it stick. Didn't have it matted and no A/C in those days. I do not have her tedious nerves....ugh. But I'm glad I got her !!!