[pure-silver] Re: Problem with 2 tray hypo (fixer).

  • From: Bogdan Karasek <bkarasek@xxxxxxxxxxxx>
  • To: pure-silver@xxxxxxxxxxxxx
  • Date: Thu, 03 Dec 2009 23:52:52 -0500

Thank you, Richard.
I think I'll go the bleach way. Stay away from the acid. In high school, saw the results of a chem experiment that went sour, involved sulphuric acid, not pretty.
Anyway, yes, it was the same tray for both Hypo2's. Actually, I've been using the same tray for the same chemicals for close to eight years. Two different size developer trays, red STOP bath tray, two white Hypo1&2 trays, and 1 water filled holding tray. All marked as such on front and back lips in black indelible ink.
I am always worried about cross-contamination due insuuficient washing so this way, the same chemistry i in the same tray, but I hadn't thought of this angle. Both hypo tray get introduced to Bleach. Subito!
Should I maybe be thinking of getting new trays. These are plastic. How about recyling them. cleaning out the hypo trays with blrach and recycling them into water trays and recycling the water trays into hypo trays., something like that.
Do trays have a lifespan, how do the plastic ones measure up to the old enamel ones I used high school. I seem to remember that they were easier to clean, they were smoother, methinks, jogging my memory..... 

 Got the Sulfite.
Thanks again. Always a pleasure reading your eloquently informative missives. 

Best Regards,
Bogdan

Richard Knoppow wrote:


----- Original Message ----- From: "Bogdan Karasek" <bkarasek@xxxxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Thursday, December 03, 2009 7:33 PM
Subject: [pure-silver] Re: Problem with 2 tray hypo (fixer).



Hi all,

Just to add to the context and recap.


 NOT SULFIDE, I think this was mis-typing. Sulfite is the stuff to use.
Were both hypo baths that turned yellow in the same tray? If so, there may be something in the tray that is persistent. If it is the same tray try cleaning it with houshold bleach used full strength and allowed to soak for perhaps half an hour. Then wash out with dishwashing detergent and hot water. The other cleaner is the familiar "chromic acid" like Kodak TC-1. This stuff can be reused practically forever and is not as dangerous as some think although potassium bichromate should be handled with great care. The prepared cleaners were a lot safer than using dry bichromate to make up the solution from scratch. This cleaner will remove silver and silver compounds like silver sulfide, that might have collected on the tray. Hypo can accumulate a lot of silver and it will eventually become silver sulfide in the bath especially if there is no sulfite there to prevent decomposition of the thiosulfate and the silver complexes it forms. The bleach is much easier to obtain and should be tried first. 

Kodak TC-1 Tray Cleaner

Water                               1.0 liter
Potassium bichromate               90.0 grams
Sulfuric acid, concentrated        90.0 ml
The usual Kodak warning applies: Add the acid to the water, never the water to the acid. Sulfuric acid has a very high heat of solution and will spatter if water is added to it. For use pour the solution into a tray and swirl around for a couple of minutes, then pour out and rinse the tray thoroughly in running water. 

--
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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