Hot Process Soap is a method of making soap where the ingredients are heated during the saponification process. This technique involves mixing oils and lye, then cooking the mixture to speed up the chemical reaction that turns them into soap. The result is a more rustic-looking bar that can be used shortly after cooling. Unlike Cold Process Soap, which requires a longer curing time, hot process soap can be ready for use in just a few days. This method allows for the addition of fragrances and colors at the end of the cooking process, giving soap makers more control over the final product.