After the print, we can add a metallic foil on the print liner. The result will be a metallic surface such as gold or silver. In combine with emboss, this will look extra exclusive.
Another method is to start from a silver sheet. This will first be printed with white only on the surfaces where you don't want it to shine through. After that, the ordinary colors will be printed. With this method, we can produce different effects on different places of the package. It can look like an ordinary four-color print on some places meanwhile it can look like metallic colors on another place. This gives the designer a huge latitude, and if it's used in the correct way, some real interesting effects can be made with this technique.