[pure-silver] Re: sodium thiosulfate

Thanks Richard, Mark & Howard.  

I went ahead & mixed a batch of R5a and added a gram or 2 extra of thiosulfate 
in case there was water adding weight there.  
The mix calls for 30 mls A solution and 120 mls B solution so I used 25 mls of 
A and 120 of B to make it a little weaker.  
Well it could be a little weaker still and I woulda-coulda-shoulda tested it on 
a junk print, but it was just a 5x7 I didn't want to reprint.  I also should 
have saved the dang mix and tested some more but got annoyed and dumped it so I 
wouldn't spill it and ruin something else!  =)

Since the thiosulfate acts as a "restrainer" in this situation, it was more 
important to know if there were any chemical changes affecting that ability 
than if the weight might be a little heavier if it took on water from the air.  
It's been pretty dry here (if my nose is any indication) but it was stored as 
mentioned throughout the summer here in Chicago.

I'll try posting somewhere Ryuji-san hangs out. ;)

Eric



________________________________
From: Richard Knoppow <dickburk@xxxxxxxxxxxxx>
To: pure-silver@xxxxxxxxxxxxx
Sent: Wednesday, November 26, 2008 10:23:43 PM
Subject: [pure-silver] Re: sodium thiosulfate

Eric

    This is really a Ryuji Suzuki question. I am aware of three hydrations of 
sodium sulfite, crystaline, monohydrated, and desiccated or anhydrous. The 
monohydrated is the most stable form. I don't know if the others become 
monohydrated with time.
    A blender may convert the chunks into a powder better than a mortar and 
pestle.

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