Why toothpaste and cement harden over time. Cements, clays, soils, inks, paints, and even toothpaste. Many paste materials, also known as dense colloidal suspensions, stiffen as they age. Structural dynamics, or changes in the loads the materials undergo over time, are partly responsible for this change, but for decades, experts have suspected that there's more going on inside these materials. Now researchers have discovered a process called contact-controlled aging that explains some age-related changes in paste materials. Source 3n.
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I wish there was more on contactcontrolled aging it should be investigated in a swift way so like we can what the big picture forms.