I used these charts to test color and fill techniques. They're cheap, so I don't mind if the experiment fails. The problem is that they keep deforming. It's not much, and they'll probably line up when framed, but I don't usually intend to frame them. I also have a 5" x 7" size that also warps, but I can straighten it out by turning it over a few days after the paint has dried.
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