Natural colors can be obtained by adding 2 tablespoons red clay, Calendula petals, or yellow palm oil. The following recipes result in soap with very little excess fat. This soap leaves skin perfectly clean and smooth feeling. Some people like excess fat in recipes. To superfat soap, I recommend 2 to 4 tablespoons additional fat, such as castor oil.
Castor oil is emollient and contributes to soap lather.
To superfat with other fats, you can subtract about .2 oz weight lye from one lb batches of soap recipes which allows excess fat to remain. This is the only recipe I've discovered that remains scent-free without adding fragrance to the recipe. This soap is a bit too harsh for bath soap, but great for cleaning, washing dishes, delicate laundry, etc. Great lather and no fragrance. Oil room temperature.