Adox HR-50 developed in Caffenol LC+C looks like London fog?

[John Wiegerink]

I have never tried any of the Caffenol developers until tonight. I decided to try Caffenol LC+C on a partial roll of HR-50. While the images look very good and very sharp the negatives have a lot of base fog. I'm pretty sure I can print through this, but was just wondering if this was normal or not. Also, I didn't have Folger's crystals and just used my stores cheap house brand instant coffee. I don't think that would cause the fog, but you never know. Or at least I never know since this is my first try. Do other folks here get pretty heavy base fog with Caffenol?

 

[koraks]

Yeah. It's a bit like toning cyanotypes etc. in coffee - the coffee stains the base. It's the same as your dentist complaining about "sir you must be drinking a lot of coffee, I'll ask my assistant to make an appointment with you to clean the staining a little" LOL.

Caffenol is effectively a staining developer in the 'bad' sense of the word: it adds an overall stain, but not an image-wise stain. So it's kind of the opposite of e.g. Pyrocat.

 

[John Wiegerink]

Yeah. It's a bit like toning cyanotypes etc. in coffee - the coffee stains the base. It's the same as your dentist complaining about "sir you must be drinking a lot of coffee, I'll ask my assistant to make an appointment with you to clean the staining a little" LOL.

Caffenol is effectively a staining developer in the 'bad' sense of the word: it adds an overall stain, but not an image-wise stain. So it's kind of the opposite of e.g. Pyrocat.

Koraks,
I figured it would discolor the negatives some, but didn't think the stain would be this heavy. I'm on my way to the cottage and the negatives are left down home or I'd show them. When I get back down home I'm going to try this again, but I might try a touch of KBr in the next batch to see if it makes a difference.

 

[koraks]

I don't expect bromide to do anything about this since the staining is likely just the coffee painting the gelatin, not so much silver fogging. Although the latter can also play a part of course. In that case KBr will help tone it down a little.

Btw, I have to admit I'm kind of the wrong audience for this; I never quite understood the attraction of these coffee developers. The way I see it they're fairly inefficient and the whole eco-story to surround them sounds fishy to me in the light of the quantity of instant coffee that's needed and the overall impact that has over its product life cycle. From a technical viewpoint it's very obvious that there are plenty of superior alternatives, many of which are very cost-effective and sometimes even relatively ecologically benign (instant Mytol etc.)