From: Scott Walker (walker@sympatico.ca)
Date: 07/27/03-07:33:25 PM Z
Hi, Thanks for the recipe. If you want to make this recipe the alcohol
recommended by Hoescht is Methyl.
I am interested in having others try this dye in the near future (I don't
have much time now to make and ship little bottles right now, but would be
happy to do so in about a month).
Let me know if you are interested,
Scott.
-----Original Message-----
From: martinm [mailto:martinm@SoftHome.net]
Sent: Saturday, July 26, 2003 1:08 AM
To: alt-photo-process-l@sask.usask.ca
Subject: Re: Bromo-iodide Silver Gelatin Emulsion as an Alternative
process
----- Original Message -----
From: "Ryuji Suzuki" <rs@silvergrain.org>
To: <alt-photo-process-l@sask.usask.ca>; <martinm@SoftHome.net>
Sent: Friday, July 25, 2003 8:41 AM
Subject: Re: Bromo-iodide Silver Gelatin Emulsion as an Alternative process
> I can't look it up now, but I remember Baker's book described a that
> dye (along with Orthochrome T) with suggested doses in terms of a per
> cent fraction of AgBr (was it something like 0.05%?). (definitely not
> meant to be a recipe.)
The formula I found is based on Baker:
A
gelatin............................20 g
water.........................390 ml
Gelatin is dissolved at 35°C and then filtered. Take 80 ml of solution A and
add solution B to it:
B
silver nitrate.....................4 g
water...........................10 ml
To the balance of solution A add and dissolve 3.2 g potassium bromide. When
KBr has been completely dissolved, the solution is slowly opoured into the
gelatin silver-nitrate solution. After precipitation add the following dye
solutions:
Pinacyanol............................(1:1000 alcoholic solution) 4 ml
Orthochrom T......................(1:1000 alcoholic solution) 4 ml
Acridine orange......................(1:500 alcoholic solution) 4 ml
It appears that this dye combination goes back to Lehmann who patented a
Lippmann emulsion (~ 1905).
Martin
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