[Alt-photo] salted paper
nl at nedlewis.org
Wed Sep 14 17:44:17 UTC 2016
I think I remember reading a Rodolfo Namias recipe that includes zinc
Chris, I'm curious why you say that arrowroot would be perfect for platinum
toning... is there a reason why platinum toner would work better or look
nicer with a matte print or with arrowroot? Or just that platinum toning
was common during the same era that starch or arrowroot was in use?
On Wed, Sep 14, 2016 at 8:36 AM, Serdar Bilici via Alt-photo-process-list <
alt-photo-process-list at lists.altphotolist.org> wrote:
> Hi Christina,
> I haven't tried that formula. I recall reading in some old text that in
> small amounts cupric chloride helps to increase contrast.
> I've just adjusted the regular formula (salt, citrate and gelatine) and
> replaced the table salt with cupric chloride.
> It was an attempt to achieve different colors with salt prints. Cupric
> chloride prints out as expected.
> The print is very beautiful magenta much vivid than regular salt prints but
> it starts to fade in wet process.
> I tried a few chemicals in first wash to precipitate the copper hoping that
> it wont bleach the silver image but no success.
> I think I might have seen zinc chloride somewhere. It is quite soluble in
> ethanol, that is why I tried it with collodio-chloride (as strontium
> chloride substitute).
> It works with regular salt prints too. Salt print with zinc chloride prints
> quite fast, but they are very prone to bronzing. Nothing special about the
> color, Zinc chloride is hard to store, it is very very deliquescent.
> What about casein for sizing?, someone must have tried that.
> On Wed, Sep 14, 2016 at 6:06 PM, Christina Z. Anderson via
> Alt-photo-process-list <alt-photo-process-list at lists.altphotolist.org>
> > How exciting; I have added quite a few of you now to my list!
> > Serdar, did you do Thomson’s formula of 1908?
> > 18g cupric chloride
> > 18g gum arabic
> > 1 liter water
> > up to 1ml potassium dichromate 1% optional.
> > Silver is 12.5% with 5.7% added citric and 0.5% gum arabic.
> > He goes on to say that either ammonium or sodium will suffice as well.
> > I think Marek might have tried it, too, and found it a bust. Marek, am I
> > remembering this correctly?
> > I can count that in all the formulas I recorded 88 use ammonium 66 use
> > sodium 7 use barium, 1 cupric, 1 strontium. So obviously barium, cupric,
> > strontium were outliers. I’ve used barium and did not like it. I sized
> > more sheets with it to see if I still feel that way. The color was a
> > yellow-brown and the paper felt like it had a deposit on it, scratchy.
> > 64 gelatin 26 arrowroot or common starch, 54 no sizing agent, 3 agar
> > 1 Icelandic moss.
> > Of course, by far albumen is ubiquitous in the literature but I wasn’t
> > researching it.
> > In other words I can see trends, e.g. from no sizing at all until gelatin
> > came in and in the late 1800s arrowroot was talked about a lot because
> > glossy was out, matte was in, and it was perfect for platinum toning.
> > The big variance is in the amount of gelatin. 1-28g per liter. I usually
> > use 8, tried 20 and I did not notice any benefit to a larger amount. The
> > most common amount back in the day was 2.3g
> > OK enough geeking out for the day.
> > Chris
> > On Sep 13, 2016, at 11:45 AM, Serdar Bilici <sbilici at gmail.com> wrote:
> > > I do salt prints too. I have been stalking all the salt printing posts
> > for a while.
> > >
> > > Btw, I have tried using purely cupric chloride for salt prints. There
> > is no way to stop the bleachig while wet processing due to the presence
> > copper.
> > > But in very small amounts it is a better contrast control agent than
> > dichromates.
> > >
> > > Regards
> > > Serdar
> > >
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