| http://www.w3.org/ns/prov#value | - Paper, foam core tyvek all will help but foam core or even a piece of mat board will keep the canvas from being pushed.I love his from Hugowolf:Another reason I leave the back of the canvas open most of the time is because it allows my clients to see the high quality, beautifully crafted wood stretcher bars and they can appreciate the quality of the product from the print to the keyed stretchers.S
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