| Richard, Hello
  I'm not sure if there is a correct amount. I reference an article by  
Andrew Westcott.  He tried various  % and wound up at 10%. He is  
primarily concerned with restoring small artifacts. Then---other than  
small, maybe our Healeys qualify.
Google his name. Interesting web site.
                   Dave
PS I forgot to mention Wescott says to  keep metals other than iron  
out of the tank. I stripped a steel part with a brass rivet and it  
worked fine. maybe it degrades the solution.
On Feb 11, 2009, at 7:21 PM, richard mayor wrote:
Hi Dave, I only have one question, regarding the washing soda. I have  
always thought that you only need to use about one tablespoon per  
gallon. Does using more enhance the process?  Richard
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