DuPont/Defender 56-D

[Gerald Koch]

Gerald Koch submitted a new resource:

(there was a url link here which no longer exists) - DuPont/Defender 56-D

A rapid commercial paper developer.

Distilled water (50°C) ................. 750 ml
Metol .................................. 3.3 g
Sodium sulfite (anhy) .................. 33.5 g
Hydroquinone ........................... 10.0 g
Sodium carbonate (mono) ................ 65.8 g
Potassium bromide ...................... 3.3 g
Distilled water to make ................ 1.0 l

Usage

For use dilute 1+2, develop for 1 to 2 minutes at 20°C.

(there was a url link here which no longer exists)

 

[Sean]

Comments from the previous article system:

By titrisol - 07:19 PM, 05-01-2006 Edit Rating: None
Thnaks Gerald!!!
By Peter Schrager - 04:37 PM, 05-02-2006 Edit Rating: None
Gerald-what is this recommended for? I have used and liked D55 very much. Thanks for posting
By Gerald Koch - 05:37 PM, 05-02-2006 Edit Rating: None
Someone asked for this formula. I have never used it but from the description assume it to be a general purpose paper developer. However, it is at least 50 years old and may not be useful for today's papers.
By Raymond Copley - 02:25 PM, 05-30-2006 Edit Rating: None
In the Cartier-Bresson classic "The Decisive Moment" published in 1952, there is a technical note that Magnum's standard paper develop was Defender 56 and preferred paper then was (and probably still is) Ilford Multigrade.