Cold Fusion (IMAGE) American Chemical Society Caption A new "calorimeter," shown immersed in this water bath, provides the first inexpensive means of identifying the hallmark of cold fusion reactions: the production of excess heat. Credit Melvin Miles Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.