[pure-silver] Re: Rodinal
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Sun, 27 Feb 2011 15:28:04 -0800
----- Original Message -----
From: "richard lahrson" <gtripspud@xxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Sunday, February 27, 2011 12:48 PM
Subject: [pure-silver] Rodinal
Hi,
I just mixed up a liter of Rodinal type developer from
Photograper's
Formulary (Paraminophenol Fil Developer) which has
been dropped from their catalog. The kit uses Potassium
Hydroxide and requires some care in keeping the
temperature
under 60 F when adding the water to dilute, it becomes
hot.
Probably why it was dropped.
The mixing went smooth but I miss picking a bottle of
Rodinal
off the shelf. Anchell's Film Developer Cookbook uses
Sodium
Hydroxide instead, so I'll use that next time.
I put it in two pint bottles. Is there any advantage
in refrigerating
one of them? Rodinal keeps rather well, and I used
distilled, boiled
water.
Rich
Agfa may have used several hydroxides in Rodinal but I
think the postassium salt will dissolve in greater quantity
than the sodium salt. AGFA had copious amounts of potassium
available as a by-product of something else they made so
they used a lot of potassium salts in their products.
The heat of solution of the sodium salt is just as high
as the potassium salt.
--
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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