From: Niranjan Patel (niranjan.patel@worldnet.att.net)
Date: 10/27/03-12:20:37 PM Z
Why not just add sodium carbonate (Na2CO3) solution to the and obtain Yellow
precipitates of Silver Carbonate. You might have to use in excess of what
is required to neutralize the nitric acid.
----- Original Message -----
From: "Sandy King" <sanking@CLEMSON.EDU>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Monday, October 27, 2003 11:03 AM
Subject: Re: Test for Silver Metal in Print?
> Ryuji wrote:
>
>
> >
> >> Couldn't you just (on a scrap print) do a silver bleach -- potassium
> >> ferricyanide or the like -- and then fix?
> >
> >That's a good test if you are concerned about the stability of image
> >against oxidative attacks but it wouldn't be a good test for detection
> >of metallic silver. If silver surface is converted to something that
> >cannot be bleached due to the toning process, for example, you'd get a
> >false negative, while you might be converting the image completely to
> >something non-silver that also gets bleached, leading to a false
> >positive.
> >
> >--
> >Ryuji Suzuki
> >"Reality has always had too many heads." (Bob Dylan, Cold Irons Bound,
1997)
>
>
> How about soaking print in a 3-5% solution of nitric acid, doing
> reflective readings before and after? Would that test for the
> presence of metallic silver?
>
> Sandy
>
>
> --
>
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