Invisible Item Frames - Slabserver/Slabserver-Tweaks GitHub Wiki
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Item Frames can be made invisible by throwing a Splash or Lingering Potion of Invisibility. You can revert the invisibility using a Splash Water Bottle (or by just breaking the item frame).
For lagbusting reasons, Item Frames require an item in them in order to be turned/remain invisible. Invisible Item Frames will become visible if an item is removed, but turn invisible again if an item is re-added.