Another name for museum board is rag board because it's made from cotton, as opposed to acid-free boards which are made from wood pulp. The board made from wood pulp will leave a brown line around your art. Cotton board will not do that. If you're framing fine art, you would want to use museum rag board. Rag board costs about one and one half times the cost of acid-free board.
Most people like to see a flat picture after it's been framed.
It's easy if it's a poster, photo or some other flat object. But if you have an original piece of art that was painted on paper with acrylic paint, oil, or some other wet substance, chances are it will have some ripples and rolls in it. If it's not harmful to the piece, Framers, Inc. includes dry mounting at no extra cost at the time of framing your picture. Business Hours Mon-Fri 10 a.m. to 6 p.m. Saturday 10 a.m. to 3 p.m.