Raw Sugar is made up of sugar crystals that have a thin film of impurities on the surface. It is mixed with hot impure syrup which softens the film. This mixture, known as magma, is a dark brown viscous mass. Magma is fed sequentially into centrifuges.

This centrifugal force separates the raw crystals from the impure raw syrup. The sugar is sprayed with water for a few seconds during the spinning, which helps to remove the last traces of impure syrup. The clean raw sugar crystals from these centrifugal machines are then dissolved in water to produce raw melter liquor. This partially purified sugar liquor now goes to the next refining process, carbonatation, which will clarify the liquor and remove some colour.