Translation:Shulchan Aruch/Orach Chaim/258
It is permissible on Erev Shabbos while it is still day to put a vessel with cold food on top of a warm pot because this is not insulating with something that gives more heat.
It is permissible on Erev Shabbos while it is still day to put a vessel with cold food on top of a warm pot because this is not insulating with something that gives more heat.