1933 US Dept of Commerce - "Comparison of Several Developers..." PDF

Kino

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• Dec 28, 2019

• #1

Found this while kicking around the dusty corners of the Internet.

Thought it might be of interest to some.

https://nvlpubs.nist.gov/nistpubs/jres/11/jresv11n3p379_A2b.pdf

 

BrianShaw

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• Dec 28, 2019

• #2

I’m not too sure how useful, to me at least, but very interesting. I love this kind of historical stuff. Thanks, Kino.

 

Bill Burk

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• Dec 28, 2019

• #3

Thanks. I just read this morning about the 1930 advice to use a “single reducer” developer instead of “metal-hydroqinine” combination. In this paper it shows you get about a third stop more speed with the MQ developer, but if you add bromide you lose about a stop and a third.

 

BradS

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• Dec 28, 2019

• #4

Yeah, thanks for posting this. I too love this historic stuff. This is quite interesting.

 

Alan Johnson

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• Dec 29, 2019

• #5

Some forgotten info there.
Metol-hydroquinone can be replaced by p-aminophenol-hydroquinone
Sulfite-p-aminophenol deposits crystals of p-aminophenolate not sulfite , of interest with PaRodinal which slowly deposits crystals.

 

Alan Johnson

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• Dec 29, 2019

• #5

Some forgotten info there.
Metol-hydroquinone can be replaced by p-aminophenol-hydroquinone
Sulfite-p-aminophenol deposits crystals of p-aminophenolate not sulfite , of interest with PaRodinal which slowly deposits crystals.

 

Alan Johnson

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Nov 16, 2004

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• Dec 29, 2019

• #5

Some forgotten info there.
Metol-hydroquinone can be replaced by p-aminophenol-hydroquinone
Sulfite-p-aminophenol deposits crystals of p-aminophenolate not sulfite , of interest with PaRodinal which slowly deposits crystals.