9.2.3 Water
Water thickens liquid chocolate, with the sugar particles sticking to one another and stopping it flowing properly. This means that high-moisture chocolate will keep its shape, but it is very difficult to mould or enrobe, so it is necessary to find processing ways of getting around this. One way is to add water in the form of fine droplets just before the chocolate is moulded. If this is done quickly before the water has the chance of attaching itself to the sugar, then the chocolate remains thin enough to process.
If a product has a moist centre it will become much more heat resistant than one with a dry centre such as a KitKat. The reason is that some of the moisture migrates from the centre through the chocolate, dissolving the surface of the sugar particles as it goes and sticking them to the neighboring pieces. It is equally possible for the moisture to migrate from the outside into the chocolate and a Mars patent describes putting chocolate products in water-permeable wrappers and then storing them in high-humidity rooms.
A third method is to add the water in the form of a water-in-oil emulsion, i.e. water droplets coated by an emulsifier such as lecithin, all surrounded by a fat such as cocoa butter. Care must be taken when adding the emulsion to the chocolate as vigorous stirring will break the emulsion and release the water. When carried out correctly, however, the water will slowly migrate throughout the product.
Although water will give the product good shape resistance above the melting point of cocoa butter, the texture is often more crumbly than normal chocolate and it often has a poor gloss.
9.2.4 Building a Framework of Solid Particles
9.2.3 WaterWater thickens liquid chocolate, with the sugar particles sticking to one another and stopping it flowing properly. This means that high-moisture chocolate will keep its shape, but it is very difficult to mould or enrobe, so it is necessary to find processing ways of getting around this. One way is to add water in the form of fine droplets just before the chocolate is moulded. If this is done quickly before the water has the chance of attaching itself to the sugar, then the chocolate remains thin enough to process. If a product has a moist centre it will become much more heat resistant than one with a dry centre such as a KitKat. The reason is that some of the moisture migrates from the centre through the chocolate, dissolving the surface of the sugar particles as it goes and sticking them to the neighboring pieces. It is equally possible for the moisture to migrate from the outside into the chocolate and a Mars patent describes putting chocolate products in water-permeable wrappers and then storing them in high-humidity rooms. A third method is to add the water in the form of a water-in-oil emulsion, i.e. water droplets coated by an emulsifier such as lecithin, all surrounded by a fat such as cocoa butter. Care must be taken when adding the emulsion to the chocolate as vigorous stirring will break the emulsion and release the water. When carried out correctly, however, the water will slowly migrate throughout the product. Although water will give the product good shape resistance above the melting point of cocoa butter, the texture is often more crumbly than normal chocolate and it often has a poor gloss.9.2.4 Building a Framework of Solid Particles
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