From: poutnik4nntp@gmail.com   
      
   Dne 04/03/2016 v 01:30 irix napsal(a):   
   >   
   > hi, I distilled several times black wine and the flask now have a "cream"   
   > around.   
   > I try out, nitric, hcl, sulfuric, sal of tartar, amonia, naoh, dishes soap...   
   > and nothing worked like hcl on lime, so when the problem is lime a bit of hcl   
   > and clean like new. what for this case? before I try naoh hot and concen. or   
   > other strong stuff... exist something like hcl in lime for this wine   
   yellowish   
   > "cream"????   
   >   
   > TIA   
   >   
   It could be a layer of denatured proteins.   
      
   I have only idea about quite drastic ways - Chrom(VI)-sulphuric mixture,   
   used for cleaning of laboratory glass/quartz equipments   
   from traces of organic.   
      
   But it would be hard to apply to large volume flasks,   
   and quite dangerous.   
      
      
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