FX10

[Lachlan Young]

Water-------------------------750ml
Sodium Sulphite----------------100.0 grams
Kodak CD-2--------------------7.5 grams
Hydroquinone-------------------6.0 grams
Borax--------------------------4.0 grams
Boric acid, crystalline-----------4.0 grams
Water to-----------------------1 litre

CD-2 is a ppd derivative used in colur developers.

Crawley reccomends 5-11 minutes at 68F/20C

Darkroom cookbook suggests diluting 1+3

He also says that if Fine grain effect is too great with dichroic fog resulting then sulphite can be reduced. Alternatively, boric acid could be reduced or borax increased or both. Development times would shorten.
For even finer grain with a loss in film speed and a heightened risk of dichroic fog increase the boric acid and increase development time.

Formula was intended for use without replenishment to develop 6-7 rolls/litre - with development time increased by approx. 5% each time it is used.

This formula seems to be remarkably similar to Calbe A49 - both use CD2 and both have pretty similar development times as well as similar capacities.

I have yet to find any other B&W formulae that use CD2.

[Sean]

Comments from previous article system:

By Gerald Koch - 08:47 PM, 05-10-2006 Edit Rating: None
CD-2 is one of the older color developing agents and has been superceded by CD-3 and CD-4. I looked some time ago for a source of CD-2 and was unable to find anyone who supplied it.
By Ian Grant - 10:03 PM, 05-10-2006 Edit Rating: None
I can supply CD-2 in the UK. Have all the remaining stocks from Hogg Lab Supplies, it's old stock but keeps well. Also CD-1, CD-3, CD-4 and one or two thers.

There are B&W formulae for chromogenic processing of B&W papers, essentilaly a very simple colour developer to wich you add the relevant dye-coupler. Tetenal used to sell a kit at one time.
By billtroop - 10:07 PM, 06-30-2006 Edit Rating: None
The formula did not originally contain CD-2. When I asked Geoffrey Crawley about publishing this formula in the Film Developing Cookbook, he suggested CD-2 as a replacement for the original chemical, which was no longer available. You could obviously use one of the other ppd-derivs as well. The formula will have to be adjusted to modern films in any case, as my comments about adjusting boric acid, borax, and sulfite indicate. These comments are mine, I think I made clear in the text - they do not come from Crawley, who has not pursued this kind of development for some decades.
By commiecam - 10:09 PM, 09-04-2006 Edit Rating: None
I believe that A49 is supposed to be analogous to the old Agfa Atomal. If that is so,
then CD2 is a replacement for the original Agfa developing agent, Hydroxyethyl Orthoaminophenol. Atomal was a VERY fine developer, producing a net speed gain similar to that which occurs in MQ developers when you replace the Matol with Phenidone. In other words, all the way back into the late 1930s, Atomal was delivering 1/3 to 1/2 stop more than D76, while prroducing measurably finer grain.

The chemical was available ten or so years ago, I think from Alfa Chemical.

Ed Lukacs