[pure-silver] Re: Buyer found for AGFA Photo

Richard Knoppow wrote:

----- Original Message ----- From: "Charlie Thorsten" <charlie_thorsten@xxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Sunday, November 27, 2005 3:00 PM
Subject: [pure-silver] Re: Buyer found for AGFA Photo



<snip>


Ilford makes a fairly full line of developers but ID-11, their equivalent to D-76 is not buffered and they make nothing like Xtol. Fortunately, D-76 is easy to make from scratch and the formula for Xtol is in the patent. Ryuji Suzuki, who follows this list, has devised an Xtol type formula which has improved stability. Its on his web site at http://www.silvergrain.org Developers like Kodak T-Max are evidently very similar to Ilford Microphen or DDX, again, published formulas for this kind of developer exist. Mixing your own is something of a PITA but was done for decades and is certainly better than doing without.
Replacing some of the Agfa developers is not so simple because the formulas are unpublished and Agfa tended to use somewhat exotic developing agents in some of them. It is possible to make Rodinal but the exact formula and, especially, method is not publically known. The main difficulty in making Rodinal appears to be the safety considerations in making up a highly concentrated solution of Potassium hydroxide due to the very great amount of heat evolved and highly caustic nature of the solution. In any case, I consider Rodinal mostly a special effect developer, there are better ones for grain and speed.
I miss having a variety of printing papers available. Freestyle has tried to compensate the loss of Kodak and Agfa by stocking papers made by Foma, Efke, Kentmere, Oriental, and a couple of others. I have no proof but think the technology available to Kodak, Agfa, and Ilford, especially Kodak, was miles ahead of the small manufacturers. We may once again have to deal with coating problems, etc. Its all very frustrating.


---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx


Te difference between buffered and unbuffered d76 is only a little bit of boric acid, isn't it? (my books are still in Wilma-proof boxes). If so, isn't it possible to make ID11 into a buffered D76 by adding a pinch of boric acid on mixing?

Boric acid is available even from grocery stores for those who don't stock raw chemicals.

Bert
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