lipid molecules have characteristic melting points. In general the larger and more saturated the molecule the higher the melting points bus because real food oils contain a very wide mixture of triglycerides the overall melting of the fat will occur over a range of temperatures rather than at a specific point. Although the melting properties of a solid fat are a function of temperature alone crystallization requires both a nucleation and a growth step . A liquid oil can be cooled below its melting point for a significant time before crystallization is initiated. Fet crystallization is further complicated as there are multiple crystalline forms possible (polymorphism). polymorphism is particularly important in chocolate manufacture. when chocolate is melted and re-hardened it sets into a different structure hich gives it a different taste texture and melting point. Cocoa butter is a key ingredient in chocolate and it has six main polymorphic forms (I-VI) as shown in Figure 1. In general Type V is the desirable form because it has a melting point close to body temperature so it stays solid on the shelf and melts in the mouth. Type V is also