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We report a very strong and reproducible effect of a small dc bias (-21 to +21 V) on ice adhesion to stainless steel. The effect was found in ice doped with 0.5% NaCl and was absent in very pure ice grown from deionized water. The doping was used to enhance ice electric conductivity. Neither the application of ac voltage nor direct electric heating of the same power as the dc bias caused any noticeable change in ice adhesion. Different physical mechanisms of ice adhesion to metals and possible explanations to the effect are discussed. Generation of electrolytic gases resulting in interfacial cracking is thought to be responsible for the effect. © 1999 American Institute of Physics.