Sometimes many paintings or other wet media often look alike. Most times, I try to distinguish between classes by color of media or color of paper but when that's not possible, I use 'markers' with class numbers on the shelf racks of my drying rack.
They are made by cutting off the rim of plastic lids. Punch a hole about a 1/2" from the edge and cut a slit to the hole. Label with a sharpie or other permanent marker. I color code mine to match the color of my grade levels (ie: orange - 1st, red - 2nd, etc.).
When I'm not using them, they hang on the back of the drying rack.
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