From: poutnik4nntp@gmail.com   
      
   Dne 30/03/2016 v 17:14 Peter Fairbrother napsal(a):   
   > I use a 5% solution of KOH (for Brashear silvering) from time to time,   
   > frequently enough so that I don't want to make it up every time, but not   
   > so frequently that a bottle gets used up fast.   
   >   
   > My problem is what to store it in. Glass is out of the question, as is   
   > PET. PP maybe, but does CO2 diffuse through it?   
   >   
   What time scale to consider.   
   But generally, with PE bottles I would be afraid more   
   about gas-proof tighness of the opening,   
   as they are not very precise.   
   And CO2 exchange during manipulation.   
      
   How sensitive is it ?   
      
   pH check could be problematic,   
   as usual pH electrodes often do not like too high pH,   
   damaging electrode quality.   
      
      
      
   --   
   Poutnik ( The Wanderer )   
   Knowledge makes great men humble, but small men arrogant.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)