[alt-photo] Removal of residual dichromate "burn" and chemistry behind it

Peter Friedrichsen pfriedrichsen at sympatico.ca
Thu May 17 00:45:54 GMT 2012

Just wondering if it is necessary to treat a carbon print with a 
sulfite bath to reduce residual dichromate. I know that some of you 
use sulfite baths on gum bichromates. What is the standard practice 
for carbon if there is one?

Does a sulfite bath remove the light affected reduction products?, or 
is it converting it to a less visible lower valence form, reducing 
the intensity of the "stain" on exposed areas.  Is a print made more 
archival by this step?

Anyone know a bit more about what exactly is going on with sulfite reduction?

Peter Friedrichsen

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