Chocolate is sold in many forms, and with specific recipes being required for people with special dietary needs. in addition, there are particular formulations for ice-cream coating and with shape retaining properties for sale in hot climates. At first sight many products often appear very simple, e.g. Aero, but how do you put air bubbles inside a bar? Also how do you put a multicoloured centre inside a coating that is made of different types of chocolate and then manufacture the sweets on an industrial scale?