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Big particles are secret to crack-free paint The frustrating cracks that appear on newly painted surfaces could soon be a thing of the past. Physicists in India have calculated how the properties of paint, such as the size of the constituent particles, affect its ability to stay smooth while drying, which could help manufacturers to develop more effective crack-free paints (Phys. Rev. Lett. 98 218302). Paints are usually made by dispersing tiny particles, some of which are pigment, in a solvent such as water.
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