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But in a gold sol, or suspensoid, which contains particles of gold of the size used in this calculation, the gold particles do not settle, even at the slow rate as calculated above.

The conditions necessary to bring a solid substance into a colloidal mixture with some liquid, or, in other words, to produce a suspensoid sol, require that the proportion of liquid to solid shall be large and some means of disintegrating the material which is to be dispersed into very fine particles.