The (map) icon for Sulfuric Acid has a bright border at the side. Probably a glitch in the icon that wasn't noticed before at lower resolutions. It's a minor bug, but it confused me briefly as I thought it indicated a belt or other structure on the map, when there was nothing there on the map yet. Gameplay is not affected by this bug, it's just a visual glitch.
To reproduce: Open the map, create a tag and set the Sulfuric Acid icon.