Calcium carbonate (CaCO3) is one of the most abundant minerals on the Earth with a large array of industrial applications. It is extensively used by the aqueous paint and coating industries as an extender and as a pigment (due to its special white colour), typically in the range of 20-60%. Particle size control of calcium carbonate within formulations plays a vital role in various coating properties important to the paint chemists such as viscosity, dispersion stability, opacity, and tinting strength.