A 3,000 lb. batch of powder with a density of 22 lbs./cu. ft. and 30 grams of an Iron Oxide Tracer with a density of 88 lbs./cu ft. These materials were blended together with a net result of less than 1/10 of 1% Standard Deviation. The remarkable result is further qualified when you consider that 240 4-oz. samples were taken to produce this data.