[pure-silver] Re: Sepia toning & Potassium Bromide & Ira B Current
- From: <C.Breukel@xxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Mon, 5 Nov 2007 20:55:10 +0100
Well I took I small volume of developer (100ml), and added a stock solution of
KBr.
Suprisingly development with 65 g/l was fairly quick, 2 minutes. Perhaps there
is developer incorperated in Ilford MG RC, although Ilford denies it AFAIK,
perhaps a accelarator?
Best,
Cor
-----Original Message-----
From: pure-silver-bounce@xxxxxxxxxxxxx on behalf of Eric Nelson
Sent: Mon 05/11/2007 17:14
To: pure-silver@xxxxxxxxxxxxx
Subject: [pure-silver] Re: Sepia toning & Potassium Bromide & Ira B Current
Just curious, how long did you have to develop the
print with 64 gms of bromide added?
Eric
--- C.Breukel@xxxxxxx wrote:
>
> FYI
>
> Some weeks ago Richard posted below comment on the
> list:
>
> >>>>>>>>>>>>>>>>>>>
> A curiousity pointed out to me by Ryuji Suzuki is a
> patent issued to Ira Current of Ansco for warm tone
> developer USP 2,607,686. Current found that adding
> very
> large amounts of Bromide to an active developer made
> sepia
> toned prints cold sepia. This might be worth a try.
> One of
> the developer formulas in the patent is essentially
> the same
> as Dektol. Current added from 20 to 80 grams of
> Potassium
> Bromide to this. From the patent data the
> development time
> will be much increased, perhaps 8 minutes. See the
> patent
> for more data. Most of the literature will lead you
> to
> believe that adding Bromide will result in yellower
> tones
> from sulfiding toners. According to this patent this
> is not
> true _if enough bromide is added_.
> >>>>
>
>
> I picked up the patent, and got the impression
> (perhaps wrongly) that
> when you would use one of the described developers
> with increasing (big
> amounts) of KBr one could obtain warmtone/spia tones
> out of a regulair
> cold tone paper.
>
> I tried on Ilford MG IV RC with below developer:
>
> Metol 5 gr
> Sodium sulfite 40 gr
> HQ 6 gr
> Sodium carbonate 50gr
>
> In 1 liter, with increasing amounts of Kbr from 25,
> 45 to 64 grams per
> liter.
>
> Therewas no change in image tone, nor were the
> developing times longer
> than normal.
>
> Re-reading the patent I think it was more wishfull
> thinking on my side.
> Maybe I'll re-try on Kentmere Kentona, and than tone
> with a polysulphide
> toner afterwards,
>
> Best,
>
> Cor
>
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