Composite Stone, sometimes known as "Quartz", is a man-made material that involves mixing natural stone, usually crushed marble, granite or quartz with silica and polyester resin. This mixture, which contains at least 90% natural stone, is then poured into moulds to form regular sized blocks or slabs. Having completed a series of other carefully controlled manufacturing processes; the finished Composite Stone products can be worked in the same way as natural stone. One advantage of using Composite Stone is the ability to guarantee a consistency of background colour. Being man-made, the colour of the resin can be strictly controlled, thereby ensuring consistent colours from one slab to the next.