[pure-silver] Re: substitute for commercial gold toner
- From: anclancy@xxxxxxxxxxx
- To: pure-silver@xxxxxxxxxxxxx
- Date: Wed, 08 Dec 2004 04:06:50 +0000
i will check this out. Where did you find the MSDS? Never crossed my mind to
use that as a reference.
I will check the Morgan and Morgan Index tomorrow when i go into the lab to see
if they list the formula for this toner.
I believe Tim Rudman list a direct gold-thiocarbamide toner that also contains
citric acid,however it has a very short life after mixing.
Thanks to all .
ann
-------------- Original message --------------
>
> ----- Original Message -----
> From:
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> Sent: Tuesday, December 07, 2004 11:04 AM
> Subject: [pure-silver] substitute for commercial gold toner
>
>
> > Have been using Fotospeed gold toner and am looking for
> > formula that i can mix my self , as i have on hand a wide
> > variety of chemical used for other gold toners. This toner
> > is being used after selenium for extended times, long
> > extended times with no color shifts.
> > Fotospeed does not list the basic ingredients as do many
> > other makers so I don't know what they are using that
> > makes it so stable that it can be used, put away and then
> > re-used again.
> >
> > I have been doing a lot of research and have almost every
> > known formula. Have also talked with the Formulary
> > regarding their kits to determine what would be a similar
> > substitute.
> >
> > It has boiled down to GAF 231 or perhapes GP-1.
> >
> > Both contain basically the same chemicals; in varying
> > amounts. I have used GP-1 when doing split toning
> > (Jonathan Bailey's version) but it is also recommend for
> > basic protection rather than a color shift. 231 can and
> > will produce a color shift but it's discription is similar
> > to the one found on Fotospeeds directions. One indicates
> > the use of Ammonium thiocyanate altho Sodium thiocyanate
> > may be subsituted. the other indicates sodium thiocyanate
> > with Potassium thiocyanate may be subsituted. In my Morgan
> > and Mortgan index all version of thiocyanate indicate
> > their can be a substitution of any the other types.
> > My question is does it make a difference (am not a
> > chemist, so i don't know)? What i do know is that there is
> > huge difference in cost.
> >
> > It would be nice to find a substitute that could be mixed
> > and have on hand to use at a moments notice, which is one
> > advantage that Fotospeed provides.
> >
> > Any thoughts?
> >
> > regards,
> > ann clancy
> >
> The MSDS for the Fotospeed Gold toner indicates it
> contains Thiourea (AKA Thiocarbamide). I think this is what
> is used in Kodak GP-2, a gold toner intended for image
> protection of microfilm. I don't remember seeing another
> Gold toner of this type but there probably are others.
> I don't know how much if any difference the type of salt
> makes with thiocyanate, my guess is little or none.
>
> ---
> Richard Knoppow
> Los Angeles, CA, USA
> dickburk@xxxxxxxxxxxxx
>
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