Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [chemicals]

The tag has no usage guidance.

4
votes
3answers
911 views

Is there a cheap alternative to Hypo fixer?

Help! I am a photo teacher. It is near the end of the year and we just ran out of Hypo with no budget for buying more. Some black and white projects are still due. Is there a cheap alternative that we ...
6
votes
2answers
129 views

My developer went dark quickly — what went wrong?

My developer went dark in a few days, without using it... I recently change my storing pots. Is it the air or the darkness where I failed?
4
votes
1answer
113 views

Agfacolor 80s: which processing chemistry?

I purchased 2 rolls of Agfacolor 80s on ebay which have been expired since 1983. I am curious whether this film needs to be processed in Kodak's C-41/Agfa's AP70 or in the Agfacolor process known as ...
0
votes
0answers
43 views

Does film expose differently depending on time (assuming same exposure)? [duplicate]

If you took two photos on a film camera: 1 second exposure at an object x bright 10 second exposure at an object x/10 bright Will these two scenarios give physically the same reaction on film? Or do ...
5
votes
2answers
197 views

Do crystals at the bottom of R09 one shot developer indicate that it's gone bad?

I have an open bottle of R09 developer and it has crystals at the bottom of the bottle. Is it an indication that it has gone bad?
3
votes
3answers
318 views

What is important in a chemical container?

I know that you can buy datatainers for your darkroom chemistry. These are brown and plastic, presumably of some special plastic. I'm looking for alternative shapes and sizes that I can't find pre-...
0
votes
1answer
377 views

Compard Digibase C41 - Extended processing times

I'm thinking of switching from Tetenal to Digibase. My problem is, that i can't find any information about the extended processing times for the Digibase 1l Kit with the exception of the initial times ...
2
votes
1answer
112 views

Do Didymium filters exceed arsenic content allowed by European safety rules?

There are many suggestions in astrophotography forums to use didymium filters ("Red Enhancers", made by Hoya or Marumi) to decrease the influence of sodium vapour lighting. However, they are hard to ...
1
vote
2answers
1k views

Are color and b&w fixer the same?

Can I use color fixer for b&w film or vice versa?
2
votes
2answers
3k views

How to determine if chemicals for development of film are still good?

There is another question about effects of an expired developer: What are the effects of developing film with an expired developer? How to determine, without sacrificing exposed film, if a developer ...
2
votes
2answers
293 views

Is it safe to use rodinal or some other developer in the bath tub?

I am thinking of developing film and prints en-masse in a modern ceramic bath tub. Is it safe to use developers like Rodinal assuming the bath tub is going to be used for baths later? Rodinal is ...
8
votes
7answers
3k views

What is the actual color space of film in film photography?

I have been thinking about this question for a while now, and I haven't found an answer online. Modern technology (scanners, screens, digital cameras, printers...) use technical color spaces to ...
5
votes
2answers
898 views

10 months-old Ilford “Rapid Fixer” concentrate, is it still safe?

I have an almost unused 1L bottle of Ilford "Rapid Fixer" that was opened 10 months ago, used, then capped again. Is it still safe to fix B&W films with this? The "instructions" on front state : ...
5
votes
2answers
5k views

What are the effects of developing film with an expired developer?

Developers, fixers, and virtually all chemical products commonly used in film photography (or not) are prone to expiry over time. Nevertheless it is not uncommon to use expired chemicals in the hope ...
2
votes
1answer
946 views

How long does stock liquid developer last?

I have a few bottles of liquid stock-concentration developers. Some are opened and some or not, and they all date from April 2013. How long can I keep unused liquid developer for? After how long won'...
5
votes
1answer
262 views

Mixed D-76 with 3.8 liters instead of 3, is this bad?

I have a question about the water to powder ratio for D-76. The instructions say to start off with 3 liters of water in which you dissolve the powder and then top off to 3.8 liters (or 1 US gallon). ...
1
vote
1answer
285 views

Is it possible to substitute or alter color dyes during color film development?

Lately I've been really interested in film chemistry, particularly the different chemicals that they used -- not only the chemicals present in C-41, ECN-2, etc. processes that are still in use, but ...
5
votes
1answer
618 views

Do powdered chemicals expire?

I was given an OLD bag of D-76 developer made by Kodak. From the looks of it, it looks to be from the 90's or earlier. It is still sealed; however, feeling it there are clumps (probably from settling)...
8
votes
4answers
9k views

Is stop bath necessary for black and white prints?

I got my enlarger and I'm ready to start making prints. For chemicals, I have Kodak Dektol Developer and Fixer; however, I'm missing Stop Bath. I've heard conflicting reports about how necessary Stop ...
7
votes
3answers
3k views

Is there an effect of temperature on film exposure?

It is obvious that temperature plays a most critical role in developing films. It is not clear to me, though, what effects temperature might cause at the time of exposure. I didn't stumble upon any ...
5
votes
3answers
486 views

Wet photography: what's the second choice after silver halide?

All the film photography I know of - both colour and black-and-white - uses silver halide as the photosensitive component. I suppose that after over a hundred years of wet photography we have a good ...
8
votes
2answers
3k views

Can leaving a print in fixer too long cause damage/staining?

This is a question for you oldskool B&W photographers, I'm hoping there's some of you out there ;) I am just getting round to sorting out my darkroom and thought I'd give it a test run now the ...
13
votes
1answer
257 views

Selenium to increase contrast?

I have been using selenium as the last step during negative development to increase durability of the negative. I was told that it can be used to increase the contrast of the negatives too. I tried, ...