Green-green decoder cardboard glasses

Green-green decoder glasses often used for commercial purposes.
The purpose is to read red printed text that is printed behind green printed text. 

• This requires a very accurate chosen color for printing.
• Often a chaotic patern is used to print over the to be discovered text or image.
• Then you prevent to discover the picture without glasses.
• The opposite glasses is red-red.
• These glasses are intend to be used once or twice. For that reason they cannot be returned.
  
  Minimum order quantity is 4 pieces.