Harry Rubin mixes up a special powder that can be either hot or cold.
Titles read: "POWDER MAGIC!"
Various shots of Harry Rubin, mixing up a magic powder that can be either hot or cold, depending on the ingredients. He stands at a laboratory bench putting powders into a test tube and a metal pan. Harry holds a thermometer in the pan, then stands two glasses of liquid in there.
Commentator says experts think if perfected for household use, the invention may revolutionise the refrigeration industry and could be used by doctors as an anaesthetic.