1) can be printed on directly by digital printing machine, solvent printer. 2)please use Solvent PVC ink 3) please don't use indoor printing machine and waterborne ink to do printing work. 4) can achieve reflection effect after common solvent PVC ink printing, if you adopt fine ink to do a printing, it can enhance the effect of reflection. 5) please adjust the height of jet head according to different thickness of crystal color grade material (0.44-0.60mm). 6) if you will use the printing machine with heater equipped, please set lower heat temperature and quantity of ink to avoid air bubble happening, although air bubble doesnt affect reflection and picture appearance