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Separately, a 200-ml capacity beaker was charged with 1.44 g of granular stearic acid, 2.08 ml of aqueous ammonia having a concentration of 0.736 mole/l and 50 ml of water, and the mixture was heated at 90° C. under violent agitation by a glass rod to completely emulsify stearic acid and form an ammonia soap. The so formed ammonia soap suspension was added to and sufficiently dispersed in the above-mentioned base slurry of tribasic lead sulfate, and the mixture was heated and aged at 65° to 70° C. for 60 minutes. The solid was recovered by filtration and the cake was dried overnight in a thermostat drier maintained at 90° C. and then pulverized by an atomizer to obtain a tribasic lead sulfate powder (Sample 2-1) having a very high whiteness.