On April 10, 1989, GTRI announced that one of its research groups, led by James Mahaffey, had duplicated the results of a controversial University of Utah experiment that had allegedly achieved cold fusion in a jar of water. Four days following the announcement, the researchers discovered that the instrument used to measure neutrons was damaged by the heat of the liquid and gave false, elevated readings. GTRI immediately retracted its support of the Utah researchers' findings, citing the flawed measurement. Director Donald J. Grace referred to the mistake as "embarrassing", recalling that he and Mahaffey "blushed the whole time".