Kodak had two cleaner formulas TC-1 and TC-3. They are listed in Kodak's
publication J-1:
https://www.scribd.com/document/428732933/Kodak-data-j1-1977-pdf
TC-1 is P. Dichromate and Sulfuric Acid; TC-3 is P. Permanganate and Sulfuric
Acid & S. Sulfite.
A stronger alternative is 'Piranha Solution', it is one of the standard methods
for cleaning laboratory ware. However, after looking at the wikipedia article
you may decide not to try it:
https://en.wikipedia.org/wiki/Piranha_solution
Nicholas Lindan
Darkroom Automation
-----Original Message-----
From: Tim Daneliuk <tundra@xxxxxxxxxxxxxx>=============================================================================================================
Sent: Jan 2, 2021 7:03 PM
To: Pure-Silver Mailing List <pure-silver@xxxxxxxxxxxxx>
Subject: [pure-silver] Calling All Chemists
OK, a ssssssss of chemistry-ish questions, if I may:
Q1: Does incidental contact between the ferricyanide in Farmers Part A
and Acetic Acid run any risk of liberating the cyanide from the Fe
and thereby creating cyanide gas? By "incidental" I mean in the drains
during tray washing/dumping, etc. It my understanding that even full
strength Acetic doesn't have the muscle to do this. I just want to
double check in the name of safety.
Q2: Other than spending Too Much Money for tray cleaning solution, is there
anything else I can use to get my developer trays white again?
I've tried straight Farmers Part A and (after a good wash) even
ordinary household bleach. These helped but did not fully remove the
stains.
Thanks,
--
----------------------------------------------------------------------------
Tim Daneliuk tundra@xxxxxxxxxxxxxx
PGP Key: http://www.tundraware.com/PGP/
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