Sublimation Photo Slate and Flagstone. Many styles. Photo slate is one kind of polished natural Metamorphic Rocks, specially designed for photo printing. It is suitable for flat clamshell press machine and very easy to operate. You personalized Photos printed on the slate with natural texture are different from the traditional photos, very beautiful and outstanding. This photo slate is perfect for decoration at home and office,a best choice as gift for friends as well.