ABOUT OUR COPAG MARKED CARDS Service life All the marked playing cards we produce are processed with the most advanced technology in the industry poker cheat . After using invisible ink to print the mark, we will add an additional protective coating. This protective coating can effectively prevent the invisible ink from being oxidized by air. At the same time, we have the best invisible ink stabilizer in the world. Therefore, our unopened products can be stored for more than half a year under normal conditions. The service life should be judged according to the intensity of use. You can contac…