Abstract: A method of managing products includes providing a plurality of products in a first arrangement in an environment. Each product includes a respective code indicative of a date. Each code has a first appearance under ambient lighting conditions in the environment and a second appearance when exposed to a predetermined radiation source. The second appearance is more visible to an observer in the environment than the first appearance. The predetermined radiation source is applied to the code to reveal the second appearance of the code. Each of the plurality products is viewed to determine if the respective code meets predetermined criteria. The products are moved into a second arrangement in the environment based on whether the respective code meets the predetermined criteria.