[pure-silver] Wash aid

I did some searching on the web and found the protocol for using sodium
carbonate as a washing aid.
 
1.  Wash the prints for 10 minutes.
2.  Soak the prints for 10 minutes with frequent agitation in a 1%
solution of sodium carbonate.
3.  Wash the prints for an additional 5 minutes.
 
Jerry

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