Cold process is a method used to make soap without applying heat. In this technique, oils and fats are combined with a lye solution at room temperature. The chemical reaction, known as saponification, occurs as the ingredients mix, transforming them into soap over time. This process allows for the preservation of the natural properties of the oils, resulting in a product that retains beneficial qualities. Cold process soap typically takes several weeks to cure, during which it hardens and becomes safe for use. This method is popular among handmade soap enthusiasts for its versatility and ability to create unique designs.