This type of product produces gentler bleaching (oxidizing) action than chlorine bleach.  The most frequently used non-chlorine bleach ingredient is sodium perborate (usually referred to simply as perborate). Potassium monopersulfate, sodium percarbonate, hydrogen peroxide, and organic peracids are used less frequently.  Non-chlorine bleach can be used safely on most fabrics, colors, and fabric finishes. Perborate is available in dry laundry bleach, and is also an ingredient in laundry detergent, presoak products, and cleanser.  A solution of hydrogen peroxide is marketed as a liquid non-chlorine bleach.  Powdered non-chlorine bleaches also contain a builder, usually sodium carbonate, which provides additional alkalinity and allows the peroxygen compound to function more effectively as a bleach.  Other ingredients such as surfactants, enzymes, brighteners, bluing agents, and fragrance may be incorporated in non-chlorine bleaches, depending on the formulation. Water temperature affects the bleaching rate of non-chlorine bleach.  Hot water accelerates the bleaching action. As water temperature decreases, bleaching time must be increased.