Dreaded Orange Spots, also known as DOS, is something many cold process soap makers have unfortunately experienced. Dreaded orange spots are exactly what they sound like…orange spots on your soap! The most common cause of DOS is rancid oils, but there are several factors that can contribute to dreaded orange spots.
Dreaded orange spots can appear on cold process soap while curing, or months after it has been made. The appearance of DOS can range from a light orange to a deep rust color. DOS may appear in various sizes and places on the soap. Some bars may develop only one spot, while some bars become completely covered. Soap with dreaded orange spots is safe to use, but it is a cosmetic issue and may develop an unpleasant odor.