Re: finally: a good HP5+ negative

About this list Date view Thread view Subject view Author view

From: Gordon J. Holtslander (holtsg@duke.usask.ca)
Date: 07/18/02-07:45:10 PM Z


D-19 should still be available. We use it here to process electron
microscope negatives.

D-76 and D-19 have very similar constituents. D-19 has uses sodium
Carbonate to raise the pH of the developer. D-76 uses Borax - which has a
lower pH than Sodium Carbonate. D-19 also has Pottasium Bromide which
acts as an antifoggant.

If you wanted to experiment you could add some washing soda (washing soda
is usually made of sodium carbonate) to D-76 - this
would raise its pH something similar to d-19 - although it will likely
fog, without any pottasium bromide.

You could get an idea of whether or not D-19 would work in your situation

If the trouble you have with d-76 is a metol skin sensitivity, you might
want to try Ilford's ID-11. I believe its very similar to d-76 except
that is uses phenidone instead of metol -people are usually not sensitive
to phenidone.

Gord

On Thu, 18 Jul 2002, Shannon Stoney wrote:

> I finally succeeded in making a good negative for cyanotype with HP5+ today.
> I processed it for 20 minutes at 85 degrees. I shot it at 3200 in my
> pinhole camera. The subject was a test scene that I set up, with a gray
> card, a piece of denim which measured two stops darker than the gray card
> for zone III, and a white plastic chair which was zone VII. The denim
> measured .31 and the chair 1.86. This is close enough for government work.
> But again, if the contrast of the scene was low and development needed to be
> expanded further, it would be difficult, I think, without simmering the film
> on the stove or something for half an hour or so!
>
> --shannon
>

---------------------------------------------------------
Gordon J. Holtslander Dept. of Biology
holtsg@duke.usask.ca 112 Science Place
http://duke.usask.ca/~holtsg University of Saskatchewan
Tel (306) 966-4433 Saskatoon, Saskatchewan
Fax (306) 966-4461 Canada S7N 5E2
---------------------------------------------------------


About this list Date view Thread view Subject view Author view

This archive was generated by hypermail 2.1.5 : 09/19/02-11:11:01 AM Z CST