Inspection of shapeability or plasticity, and thus of the moisture content of the bentonite-bonded mold sand. For the test, the mold sand specimen is squeezed by hand and compacted due to the pressure applied by the ball of the hand. From the behavior of the sand sample, experienced foundry technicians are able to draw corresponding conclusions with regard to the quality of the mold sand (Fig. 1). Sands with equal moisture content, feel equally moist but may have different water contents.