Board Thread:Show-Related Questions and Answers/@comment-3456168-20150424021008/@comment-25926288-20150424030658

It is a magical macguffin aka plot device for the episode. Like the wishing star and gauntlet of weaknesses, it'll never be seen or heard of again.

Any one could have created it. I wonder from what material it was made. Golden-brownish dirt or clay, I don't know. Maybe it was just an urn/ bread bin/ pot that was then enchanted (Enchanted stuff usually glows golden).

Rumple doesn't ever make any magical item or spell. He just hoard magic like a dragon hoards silver.

Like anything, there will only be one and no more. By logic, it should be able to liquefy all magic users, but that wouldn't make since (wonder what color they'd be besides Rumple who's liquid darkness). I think it may be limited to those who have internal power or power that's through their whole body. Rumple who's darkness, Ingrid and Elsa who're ice/snow magic goo, maybe Emma.

The gloves also should work on anyone, but it wouldn't make since for magic users since they wouldn't need it. Rumple had one and no more because clearly he had no time at all for stuff like that (I'm kidding, they won't explain that).