In the soap making process, making cold process soap and hot process soap is quite different. Often the end products look alike and it is difficult to tell them apart. The usual commercial soap purchased at a store is made using the hot process, as it is much faster to make.
In the hot soap making process larger batches can be made in a shorter processing time, thus maximizing profits. In manufacturing the soap, the glycerin in the soap is removed as a by-product from the heating process, along with the waste product, lye. This cooked soap lacking glycerin dries our skin.