SC - canning
    Mark Schuldenfrei 
    schuldy at abel.MATH.HARVARD.EDU
       
    Wed Jul 30 09:51:37 PDT 1997
    
    
  
  The wax seal seems to be a traditional way of sealing and expelling the
  air before the use of vacuum-sealed (Ball, etc.) jars came into
  widespread use. It might be a case of someone forgetting why it is there
  and assuming it was still essential. Or, I could be talking through my
  hat, which sometimes happens too.
I know the US Government has many handouts on how to can, safely.  Probably
as a throwback to the WWII era.  Ask your state of federal Agricultural
representative.
	Tibor
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