I prefer using glass picture frames. I usually get 20*30 picture frames. The reasons why I use them are several. They protect the images from airborne pollutants. Everything from methane to sulfur dioxide to breath & spit from those who look from an inch away & explain your image to everyone within earshot.
Try a few images on a wall without the glass & see how long they last before fingerprints, scratches & food get on them & you may look more positively at the glass as something needed to show the images.
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