Vintage Bubble Light Ornament

A bubble light ornament is a liquid-filled vial that is heated and lighted by an incandescent light bulb. Because of the liquid's low boiling point, the modest heat generated by the lamp causes the liquid to boil and bubble up from the vial's base thus creating the bubble light. The liquid is almost always methylene chloride, but some early bubble lights used a lightweight oil. The light from the lamp illuminates the bubbles from underneath, causing them to shine. As Christmas lights, bubble lig