A method for authenticating a target item with a security code is provided. The method includes the steps of determining a first content of security information to be coded, determining a second content of security information to be coded, printing a plurality of color tiles on a target item where the plurality of color tiles define the first content of security information, and printing one or more micro-markings on one or more of the color tiles located on the target item. The one or more micro-markings define the second content of security information.