From: mlist4@infohit.me.uk   
      
   On Fri, 21 Jun 2019 11:14:25 -0700 (PDT), Bret Cahill wrote:   
      
   >Optical taggants might be more realistic, even cheaper for the plastic bottle   
   manufacturer as well as the separation equipment manufacturer.  Lasers on the   
   separation machine see the right color reflected from a water bottle and a   
   short compressed air    
   blast knocks it off the conveyor belt.  Skippy peanut butter does something   
   similar with burned peanuts.   
      
   In the UK they look at the bottles with UV (I think) and it tells them   
   what type of plastic it is. It doesn't work with black plastic since   
   the carbon used to blacken it absorbed the UV. The machines here   
   already sort the types of plastics they can recycle out without any   
   additional stuff on the item.   
      
      
   --   
   Regards - Rodney Pont   
   The from address exists but is mostly dumped,   
   please send any emails to the address below   
   e-mail	rpont (at) gmail (dot) com   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)