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David,
All the references I have read say that replenishment of pot. ox. is
not necessary. You just keep using it forever. I have some I use that is
severalyears old. I just filter out the gook that settles to the bottom every
once in awhile.
Bob Schramm
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Bob, The question deals with the possible deterioration of the dichromate as
a contrast control agent added to the pot. ox. You are right about pot. ox.
lasting forever.