p-Aminophenol as a paper developer?

[patrickjames]

Has anyone used p-Aminophenol in a paper developer? I thought it might be worth a try due to its properties. Could anyone suggest any formulas?

Patrick

 

[john_s]

Search APUG for kodelon, an old commercial name for (a salt of) p-aminophenol. Which properties interest you? Rodinal can be used as a warm tone paper developer. I wonder if it could be a low fog developer for outdated papers? Also, Tom Hoskinson has posted a formula from an old British Journal of Photography which you can find with a search of APUG.

 

[jim appleyard]

Yes, you can use p-aminophenol for paper. I once mixed up some Rodinal for film, found out that I mixed it at a wrong dilution and then used it for paper instead of tossing it. It worked well enough, but nothing special.

 

[gainer]

Rodinal will work quite well for paper if you mix it 1 + 15 or 20. Home brewed Rodinal may need a dash of bromide solution to keep whites clean. You can use the formula for D-72 with p-aminophenol in place of metol.

 

[patrickjames]

Basically I am looking to make a powerful cold tone developer with possibly benzotriazole (sp?) as a restrainer. I would like to keep the formula as simple as possible, but what else would I need to add besides these two things? Should I mix the p-A. and then add benz. until there is no fog? Do I need an accelerator? How about something to prevent oxidization? If anyone could chime in with any opinions I would be grateful.

I took a look at the D-72 formula but would like to omit the Hydroquinone if I go that route. Is this doable? So I need to add more p-A.?

Patrick

 

[3Dfan]

You may find useful information in this thread: (there was a url link here which no longer exists)

 

[Tom Hoskinson]

Basically I am looking to make a powerful cold tone developer with possibly benzotriazole (sp?) as a restrainer. I would like to keep the formula as simple as possible, but what else would I need to add besides these two things? Should I mix the p-A. and then add benz. until there is no fog? Do I need an accelerator? How about something to prevent oxidization? If anyone could chime in with any opinions I would be grateful.

I took a look at the D-72 formula but would like to omit the Hydroquinone if I go that route. Is this doable? So I need to add more p-A.?

Patrick

A good cold (blue/black) tone print developer can be made by using a combination of Ascorbic Acid and Phenidone.

 

[marcsv]

Basically I am looking to make a powerful cold tone developer with possibly benzotriazole (sp?) as a restrainer. I would like to keep the formula as simple as possible, but what else would I need to add besides these two things? Should I mix the p-A. and then add benz. until there is no fog? Do I need an accelerator? How about something to prevent oxidization? If anyone could chime in with any opinions I would be grateful.

I took a look at the D-72 formula but would like to omit the Hydroquinone if I go that route. Is this doable? So I need to add more p-A.?

Patrick

If you're looking for a cold tone developer, P-aminophenol might not be the one for you. I've been using it for a little over 8 months now (now part of my MFA research). It gives warm tones (at 1:5 or 1:10) but at higher dilutions (1:20 up) its hard to find black areas anymore, in bromide paper at least (I have not tried this dilution on variable contrast paper yet). For aged paper (and film), i mix in a gram or two of KBr (which easier to find in my country) per batch of 250 ml concentrate.

 

[gainer]

You may avoid hydroquinone by using sodium ascorbate in its place. Ascorbic acid or its isomer erythorbic acid plus sodium bicarbonate make sodium ascorbate. For each gram of sodium bicarbonate, add 4.4 grams of ascorbic acid and a small amount of water. Let the effervescence subside before you add the mixture to the developer. The ratio of bicarbonate to ascorbic acid is not critical and you may use 1/2 spoonful of the bicarbonate for each spoonful of the ascorbic acid.

In the recipe for D-72, you could simply add enough carbonate to neutralize the ascorbic acid, but still mix the acid and the carbonate in a small amount of water and let the effervescence subside before adding the other ingredience. The CO2 remaining in the mixture will reduce pH somewhat otherwise.

You may substitute an amount of phenidone equal to 1/10 the weight of the metol for the metol in the recipe.