From: Poutnik4NNTP@gmail.com   
      
   On 09/16/2015 05:09 PM, Bret Cahill wrote:   
   >>> Anything off the shelf?   
   >>>   
   >>>   
   >>> Bret Cahill   
   >>>   
   >>   
   >> Water :-)   
   >   
   > What I really need is a dye that will not stain non polar materials, i.e.,   
   plastics.   
   >   
      
   So you need highly polar dye, with lot of carboxy or better sulphate groups   
   and low polar plastics without polar plastifiers like phthalates.   
      
   Hm.. good luck. I think you may minimize the colouring,   
   but not sure if you can fully avoid it.   
      
   --   
   Poutnik ( the Czech word for a wanderer )   
      
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