Re: A little gum test

Oops - yes I did indeed test with different exposures - I found that the
highlights blocked up lots more with the 30% solution.
I was using digital negs. I exposed in steps of 2 minutes in reflected light
and there was only a 2-minute gap between tones with the 30% and 15%
solutions, in other words, on a (normal for me) 4 minutes exposure with
saturated amm di, it required an extra 2 minutes to get the same tonal depth
with the dilute solution.

I have to say this was a fairly crude test but I thought it interesting in
light of recent discussions.

Kate
----- Original Message -----
From: "Judy Seigel" <jseigel@panix.com>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Monday, December 15, 2003 4:16 PM
Subject: Re: A little gum test

>
>
> On Mon, 15 Dec 2003, Kate Mahoney wrote:
>
> > Hi all, I have just done a little series of tests to look at the
> > difference between saturated amm. di. solution and the same solution at
> > 50% strength (which I imagine is 15% - but what would I know, I'm no
> > chemist). The results were very obvious - the half-strength solution
> > gave a much wider range of tones than the full strength ...
>
> Did you test that at different exposures? All other things being equal,
> less exposure (from less dichromate) could give more tones because the
> bottom tones wouldn't block up as much.
>
> J.
>
>
Received on Mon Dec 15 00:17:17 2003