Magnasite is a powerful liquid that can easily dissolve many things and is even capable of eating through walls.
Rom used magnasite drops to open Quark's latinum floor vault while Quark was away on a business trip, in order to store extra profits from Quark's Bar. However, he replaced the vault out of his own salary. Later, he used the drops to burn off a wall panel in the chemist's shop when he and Quark were running an errand for Vaatrik Pallra. (DS9: "Necessary Evil")