The Methylene Blue Clay Tester is used to determine the amount of live bentonite clay present in a sand sample. A five-gram sand sample is washed in a sodium pyrophosphate solution in the Ultrasonic Cleaner, Model No. 42108B. Then methylene blue dye is added to the sample until the clay cannot absorb the excess. Using a calibration factor and milliliters of dye to titrate the sample, the percentage of live bentonite in the molding sand can easily be calculated. The test requires the Ultrasonic Cleaner, Model No. 42108B. The Methylene Blue Clay Tester consists of a burette with filling and overflow flasks, one stainless steel beaker, electric mixer and agitator blade, a cast base, a repetition pipette, required chemicals, dropper rod and filter paper.