Tracing Paper: Color printers mark printouts with barely visible codes that are used to track down currency counterfeiters, as well as everyone else. logicmag.io Submitted by oolong on April 7, 2021 at 6:04 AM in articles 1 comment 6
Letter from Shenzhen logicmag.io Submitted by devtesla on July 18, 2018 at 7:10 PM in technology No comments 6
Tracing Paper: Color printers mark printouts with barely visible codes that are used to track down currency counterfeiters, as well as everyone else.
Letter from Shenzhen