From: Poutnik4NNTP@gmail.com   
      
   On 09/16/2015 05:18 PM, Martin Brown wrote:   
   > Malachite green   
      
   I am afraid malachite green is not polar enough.   
   AFAIK from my past praxis of hobby aquarist,   
   this dye used as the fish cure did colour   
   used polyethylene tubing.   
      
   But inorganic compounds should be good.   
      
   Detailed context could help, as there may be other limitations.   
      
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   Poutnik ( the Czech word for a wanderer )   
      
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    * Origin: you cannot sedate... all the things you hate (1:229/2)