The present disclosure provides for identification systems and related methods of use. The disclosed identification systems can include a first ink and a second ink, each of which can comprise one or more time-dependent properties. The first and second inks can be disposed in a spatial pattern on a substrate. A time-dependent property of the first ink can cause a portion of the first ink to migrate from one location to another location over time, and a time-dependent property of the second ink can cause a portion of the second ink to migrate from one location to another location over time. Migration of the inks can also cause the spatial pattern to change from a first state at a first time to a second state at a second time. Evaluation and/or interpretation of the state of the spatial pattern at a second time can provide information about a product.