In the Star Trek universe, the fictional material "Latinum" is valued in much the way we value gold. It's almost always referred to as "gold-pressed" (the naturally liquid substance encapsulated in gold "containers") and usually shown on-screen as rigid gold-colored bricks or rectangular tokens. "Latinum" itself is described as being a liquid, and only appears on screen as a liquid once - at the end of "Who Mourns for Morn?", when Morn apparently regurgitates a small quantity into a glass.

My question is: what was used to depict it on-screen? It looks somewhat similar to mercury, but it sloshed in the glass in a very surreal way (mercury wouldn't move like that). I'm thinking it was CGI, but based on the way Odo's shapeshifting was CGI'd I didn't think CGI was good/mature enough when the episode was produced to deliver the effect as we see it.

Was it CGI or some sort of practical effect?