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Rabbi Eli Gersten When a cold item is placed onto a hot surface, Halacha tells us to view the cold item as though it were hot, even though the item remains cold. Conversely, if a hot item is placed on a cold surface, we view the hot item as becoming cooled down. However, in this case we say that until it cools down, there is a kdei klipa transfer of ta’am. This concept is brought in the Gemara Pesachim (76a) and referred to as ta’tah gavar (the bottom surface overpowers). http://www.oukosher.org/index.php/common/article/tatah_gavar/