As that shown in Figure 1, then water was added and the compound was stirred for two hours, after that the water was drained. In this way every weighed portion was washed at least three times until the water was clear
As that shown in Figure 1, then water was addedand the compound was stirred for two hours, after that the water was drained. In this way every weighed portion waswashed at least three times until the water was clear