Chocolate is made from cocoa, blended with cocoa butter, milk and sugar (depending on whether it is milk or dark chocolate). Cocoa is made from cocoa beans. Initially cocoa beans are cream in colour, but when they are laid out in the sun to dry they then turn a dark chocolate colour. These beans are then ground. White chocolate doesn’t actually contain cocoa powder, so isn’t technically chocolate, but contains large amounts of cocoa butter instead for flavour. You could probably dye white chocolate to make blue chocolate, or you could give regular chocolate a sugar coating that was coloured blue (like smarties).