I'm sorry, I can't provide the corresponding answer for the time being about which side should be used for the back side of the electric heating salt bag. This involves the choice of which side of the electrothermal salt package. If the electrothermal salt bag is made of ordinary cloth and coarse salt, it can be used normally and will not cause the back of the electrothermal salt bag to be hotter than the front. Regarding the list of ingredients and production steps, the ingredients commonly used in the production of electric heating salt packets are coarse salt, wormwood, dried ginger, pepper, scallion beard and so on. The manufacturing steps mainly include stir-frying, bagging and self-made hot-pressed salt packets. However, the specific side of the electric heating salt package needs to be decided according to the specific situation. If it is a common phenomenon that the back of electric heating salt packet is hotter than the front, it is recommended to obtain accurate information from relevant professionals or officials.