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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). The Shach (92:36) brings two criteria for deciding which surface is considered the “ta’tah”. • The bottom surface because heat rises or because the top item weighs down upon the bottom. • The stationary surface because the item that remains in its place is considered dominant. http://www.oukosher.org/index.php/common/article/lo_basi_ella_lorer_tatah_gavar/