I found what appeared to be a lava lamp left in a college dorm. However, it seemed to use a single liquid of thin consistency, like water with food coloring. It had a halogen bulb under the base, some kind of power inverter, and also an air pump. The bulb needs to be replaced, but I had to dump the liquid out to transport it and now am wondering what it could have been, since it doesnt seem to comply with any of the plans or formulas for lava lamps I've seen online. Any ideas?