[pure-silver] Re: How Critical Is Wash Water Temperature
- From: "bobkiss @caribsurf.com" <bobkiss@xxxxxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Mon, 7 Apr 2014 15:15:11 -0400
DEAR RICHARD ET ALIA,
I also would have to dig deeply into my old books to find the source
info but I do recall that, when washing prints after normal hypo fixer
without using a washing aid, if the water temp was too cold, the
silver-thiosulfate complexes could become strongly attached to the paper
fibers making complete, proper washing nearly impossible. However, as
others have stated, using a washing aid reduces this problem. Sorry I
can't be more specific.
CHEERS!
BOB
On Mon, Apr 7, 2014 at 2:53 PM, Richard Knoppow <dickburk@xxxxxxxxxxxxx>wrote:
>
> ----- Original Message ----- From: "Laurence Cuffe" <cuffe@xxxxxxx>
> To: <pure-silver@xxxxxxxxxxxxx>
> Sent: Monday, April 07, 2014 4:10 AM
> Subject: [pure-silver] Re: How Critical Is Wash Water Temperature
>
>
>
> I used to be quite precise about this following advice in various
> technical books, but I gradually grew more casual about the wash water
> temperature as I found it did not seem to make a difference.
> This came back and bit me when I tried to develop an image on a glass
> plate, and there was about a 10 degree difference in the wash water
> temperature.
> The image gelatin just peeled off the glass plate. This turns out to be
> one of the classic ways to develop Reticulation. I don't know that this is
> what caused it, but my I felt that this behavior was probably the reason
> that that advice was given so often in older books.
> All the best
> Laurence Cuffe
>
> At the time the books of the 1930s were written the emulsions used were
> much softer and I am not sure the binders were that good. It was easy to
> cause reticulation and frilling. More recent emulsions are very hard and
> are made partially with materials other than gelatin. I have tried to
> delibrately reticulate negatives with very little success. On modern film
> it takes virtually boiling water to accomplish it. But any sort of old
> fashioned emulsion is quite vulnerable.
>
>
>
> --
> Richard Knoppow
> Los Angeles
> WB6KBL
> dickburk@xxxxxxxxxxxxx
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