[Alt-photo] Sodium Thiocyanate For Fixing Out Lumens

Don Sweet don at sweetlegal.co.nz
Fri Aug 18 04:27:15 UTC 2017


Don Sweet

On 18/08/2017 4:03 p.m., `Richard Knoppow via Alt-photo-process-list wrote:
>    I could not remember the name of AGFA Ag guard or would have 
> mentioned it before. I am glad to see you researched it and found it 
> effective since there was some doubt in popular literature. I must 
> still have several bottles of it.
>    I am sorry to hear that no one is interested in silver image 
> protection any more. I am sure that is very discouraging.
>    I am not sure of the title of James paper that I was thinking of, 
> something very similar to the one mentioned.
> On 8/17/2017 8:55 PM, Ryuji Suzuki wrote:
>> I forgot to advertise my own work.
>> Fujifilm Ag Guard is effective in protecting silver image from 
>> oxidative attacks (that is not my work, though I confirmed it myself).
>> So is an alkaline solution of 2-mercaptobenzimidazole (formula in my 
>> paper)
>> http://adsabs.harvard.edu/abs/2011JSPST..73..180S
>> The actual paper in PDF (Japanese language only) is here:
>> https://www.jstage.jst.go.jp/article/photogrst/73/3/73_3_180/_pdf
>> I sent it to Doug Nishimura and Gawain Weaver and asked if it's worth 
>> publishing in English. Some said no one was researching conservation 
>> of silver imaging material (no more research funds).... don't bother. 
>> Some also cautioned me that professional conservators are discouraged 
>> from performing any process that chemically alters the image, silver 
>> or otherwise. Although Ag Guard and 2-MBI do not alter the image 
>> itself (that is the point of this approach, as opposed to toning), 
>> and this point is explained in the paper, the distinction probably is 
>> not very clear to average conservators. So, no, there is no English 
>> version published anywhere. (Besides, this journal was one of the 
>> very few last remaining journals that published new researches on 
>> silver imaging... at that time back in 2010/2011.)
>> Ryuji Suzuki

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