Continue this until the thread just crumbles at 3 mm diameter.At the time of breaking or crumbling if the diameter is bigger than 3 mm, add slight water and knead it again to roll. Continue rolling until the thread starts crumbling. Take about 8 gm of plastic soil, make a ball of it, and roll it on the glass plate with the palm of the hand with just sufficient pressure to roll the mass into a thread of uniform diameter throughout the length.Clean the cup every time for subsequent observation.
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