| abstract |
A marking method of a plastic-based product and a marked plastic-based product are provided. Some methods involve investigating the product to change the functionalization of the plastic. In general, this disclosure features a description of a method of marking a substrate, for example, a substrate comprising plastic, such as a plastic article, such as a polymer bill. Such plastics may be rigid or flexible, e.g. elastic. Such a plastic may be a thermoplastic or thermosetting resin. In some cases, the article is marked by irradiating the plastic-based material, e.g., sheet material, under conditions that alter the properties of the irradiated plastic. |