It looks like Hackaday has picked up this article from 3dprint.com. They ask the question:
Besides the common Sharpie, there’s a slightly more interesting application of this technique of coloring 3D printer filament; as anyone who has ever been in a dorm room with a blacklight knows, you can use the dye inside a common highlighter to make some wicked cool UV-sensitive liquor bottles. Whether the ‘Sharpie technique’ works with highlighters or other markers is as yet unknown, but it does deserve at least a little experimentation.
Has anyone tried this?