Cast stone, which is sometimes referred to as reconstituted stone or simulated stone, starts with a drawing, from
which subsidiary drawings are prepared so that a skilled pattern maker can create a wooden mould. Depending on
the product and finish required, cast stone is made using a semi-dry mix of white and/or grey cements with natural or
manufactured sands. The appearance of natural stone is achieved using crushed natural stone, well graded natural
gravels and mineral pigments. A waterproofer is added to minimise moisture absorption and improve resistance to
On larger components, a coloured facing mix is used on the outside of the mould, with a higher-strength, noncoloured
backing mix in the interior.