From: na@all.com   
      
   Sorry for what may be a dumb question but I know nothing about stamp   
   collecting, and to be honest I find the subject as dull as ditch water.   
   However my dad knows I use Usenet and he asked me to find the answer to this   
   question for him.   
      
   He tells me he used to use Benzene to make the watermarks in stamps show up   
   more easily. I know from my A-level chemistry that Benzene is highly   
   carcinogenic and is now banned from sale to the public. What he wants to   
   know is if there is any other substance that is safe/legality available that   
   will do the same thing.   
      
   Thanks,   
   David.   
      
      
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    * Origin: you cannot sedate... all the things you hate (1:229/2)