Studies have been carried out to substitute magnesium chloride, a raw material for the manufacturing of magnesium stearate, by bittern which is a waste product of sea salt industry. The prepared metallic soap contains Mg 4.014.05%, free fatty acid 0.54-1.02%, and bulk density 0.32-0.41 gm/cc. The product has a reasonable purity (magnesium stearate 98%) and is comparable with the imported metallic soap available in the local market and also with the soaps prepared by using magnesium chloride as a basic raw material by the usual two step method as well as the improved single step method.