Colloid stability 243- Paints. The particles in pigmented paints are often large enough to
settle even when peptised; therefore, it is desirable that they
should be aggregated to a certain extent to facilitate redispersion.
Some other practical situations where particle aggregation is
important include the precipitation of colloidal mud at the mouth of a
river due to the salinity of the sea-water exceeding the critical
coagulation concentration, land (e.g. mountainside) stability, building
and road foundations, the retention of a porous structure in filtration,
mineral processing^117 and paper making. Control of particle aggrega-
tion is also of primary importance in adhesives, inks, Pharmaceuticals,
cosmetics, foodstuffs and lubricants.