Different Temperatures Revealing Different Images
        
        
        
        
        
        
        
        
        
          
          
          
             
          
          
          
          
          
          
          
          
          
          
        
        
          
            A research group in China has come up with a novel approach to product authentication, with a label that can be internally heated to reveal a changing image.
          
        
          
            
              
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