resurrecting an unused darkroom

So I've been offered a darkroom recently and I feel it would be a great place to process my sheet film and make some contact prints. The plumbing is decent with only one tiny leak. The ventilation system is functioning and the sink is a large steel one.

My issues are that it has been quite damp down there for a while and unused in about a year. I have reason to believe that mold has grown but not much visual evidence except for perhaps what are some strange black spots in one of the damp but mostly little used sinks. I am not entirely sure of the water quality. What tests should I run to determine whether it is safe for archivally processing my film? It does have a basic filtration in which I just replaced the 5 micron filter. Are there any concerns as to potential mold fumes and my film drying down there? What else should I be looking for? Sorry if some these questions are a little strange, however I am curious and wonder whether I should bother sinking a little money into this free darkroom or continue to travel a longer distance to my current spot. Thanks in advance.

The evidence that household mold causes human disease, much less damage to film from some purported "fumes" it might emit, is laughably weak at best––trial lawyers and gullible juries notwithstanding. That bogeyman has to rank alongside alien abduction as one of the more overhyped dangers the average person faces. Though I fully expect now to be deluged with anecdotes about someone's fungus-ridden auntie or brother.

Give it a good cleaning with dilute bleach and you should be good to go.

You face more risk from spiders than from mold.

Your film may hover be at risk from the mold if you store it in a damp location. Even if you get spores on it from the darkroom it will be fine if it doesn't get exposed to high humidity. There really is no proactical way to keep film (or anything else) free of mold spores.

I would run a dehumidifier 24/7 to keep the humidity at 50%. Wipe down any mold with bleach. It sounds like it's just on the sinks, so I imagine you are fine to move in. But be sure to fix any water infiltration issues if there are any.

I would purchase a face mask to protect my eyes and the air. Then buy the best dehumidifier you can afford.

Good luck,

Jordke said:

The plumbing is decent with only one tiny leak.

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Do fix the plumbing leak.
Roger

Another vote for the dehumidifier - it is your best friend when looking to do that kind of thing. What kind of printing will you be doing? Silver Gelatin, or any alt processes? If the darkroom has significant humidity problems, I'd be inclined to not store anything there other than processing equipment (plastic, stainless and/or glass) and pre-mixed liquid chemistry. Even with the dehumidifier, if you don't get in there for a several-week stretch, the dehumidifier tank will fill up and stop working, at which point your problem will return.

Thank you all for the input...... even MikeSeb's making fun. I do currently have dehumidifier running, but as some of you know that causes the heat to rise and it's been in the upper 80's for the past couple of weeks.... oh well I'll deal with the heat for a little while. No one addressed my questions about water quality, are there any things I should be checking for and any tests I should conduct?

You can sometimes hook the dehumidifier tank with a hose that will run into a floor drain, then you can run it without being there every day.

Jordke said:

Thank you all for the input...... even MikeSeb's making fun. I do currently have dehumidifier running, but as some of you know that causes the heat to rise and it's been in the upper 80's for the past couple of weeks.... oh well I'll deal with the heat for a little while. No one addressed my questions about water quality, are there any things I should be checking for and any tests I should conduct?

Click to expand...

If you are concerned with water quality, install a double in-line filter to the system. First filter for sediment, the second for purity(active carbon) to remove chlorine and trace elements. These are not too terribly expensive to purchase, and if you are somewhat handy, you can install it yourself. BTW congrats on getting a dedicated darkroom-- I'm extremely envious.
Rick