While I was in photo school in college, we were showed a couple of ways of properly mounting and matting prints. When mounting, we were taught to use mount tissue and mounting prints with photo corners. Also, we were also taught to use acid free mat board in both instances. I fell out of mounting with tissue since getting access to a heated mounting press was harder and favored using mounting corners with linen tape. I now have easier access to a mounting press and I'm thinking about mounting with tissue again. Do some galleries frown upon using dry mounted prints? I'd like to get a sense what APUGers are doing. I'm particularly interested in what gallery owners require for black and white fine art prints that are matted.