What Safety Precautions Should You Take In A Darkroom?

Lately I’ve been obsessing over the tiny decisions that decide whether a print lives for a week or a century, and that curiosity led me to a rather nerdy breakdown of prints in darkrooms. If a print is properly developed, fixed, washed, and dried, and you then tuck it away in true darkness, it can last decades or even over a century depending on materials. Silver-gelatin fiber prints that were well processed and optionally toned (selenium, gold) are famously durable. Color prints are a different beast — they’re much more sensitive and won’t tolerate the same long-term treatment. In an active darkroom under safelight, though, the story changes: safelights (red/amber) are designed to let you work without fogging paper, but papers have different safelight ratings. Resin-coated (RC) papers tolerate safelight exposure longer than some fiber papers, but I wouldn’t leave a print sitting under a safelight for hours; fogging can creep in. Practically, I avoid leaving important prints exposed to any safelight for more than the short time needed to handle them; for overnight storage in trays I put them in envelopes or cover them. If you’re storing prints long-term, use archival, acid-free sleeves, stable cool temperatures, and low humidity. I’ve rescued prints that were decades old and still gorgeous because someone cared about processing and storage—proof that darkrooms can be safe havens if you respect chemistry and climate.

Stepping into a dim room where the only warm glow comes from a safelight is one of my favorite rituals, and that feeling comes from having the right gear around you. At the absolute core you need an enlarger with a good negative carrier (for 35mm, medium format, or sheet film depending on your work), an enlarger lamp and condenser/diffuser head, plus an easel to hold paper straight. Trays for developer, stop bath and fixer are essential, along with stainless steel tongs, a graduated mixing jug, thermometer, and stirring rod or paddle. Paper choices—resin-coated (RC) or fiber-based (FB)—dictate drying and washing methods, so have both types tested. A clock or darkroom timer and a reliable safelight (proper filter and wattage) are musts. Beyond those basics, think about a good wash sink or wash trays, archival fixer and wash aids, a drying rack or line, dust blower, squeegee, and a negative cleaner. Ventilation and proper protective gear—nitrile gloves, apron, goggles—keep you safe. Optional but game-changing extras include a grain focuser, contrast filters, an enlarger baseboard with focusing scale, a densitometer for consistent exposures, and paper cutters or guillotines for crisp edges. Having a tidy shelf for chemicals with labels, a lighttrap or changing bag for loading film, and clamps for trays will transform the workflow. I love that while the list looks intimidating, each piece adds a small ritual that makes printing feel deeply satisfying; it’s tactile and oddly meditative to me.

Bright idea: build a tiny analog lab and watch light become silver on paper — it still feels magical to me every time. I started with a corner of a spare bathroom and treated it like a small workshop. First thing I sorted was space: I separated a 'wet' zone (for trays, fixer, wash) and a 'dry' zone (for enlarger and paper handling). Lightproofing came next — black tape on cracks, a hanging blackout curtain, and a cheap door sweep. For making prints you need an enlarger (or a borrowed one to start), a negative carrier, and a stable table. I bought three developing trays, a set of tongs, thermometers, a stopping bath, fixer, and a safelight. I chose a red GBX safelight and tested it with the paper I used. Temperature control matters — aim for ~20°C for most chemistry; I use a small aquarium heater or warm tap water to keep it stable, and a thermometer clipped to a tray. Practically, I always do a contact sheet first to check negatives, then a test strip for exposure. Dodging and burning are done with bits of cardboard and a brush or my hands; it feels like drawing with light. Ventilation is non-negotiable — open a window or use a small extractor fan. For developing film at home, I use a changing bag to load reels if I don’t have a darkroom, plus a reel and tank, developer (I often reach for Ilford ID-11), stop bath, fixer, and a dedicated sink or large wash tray. I hang film to dry with clamped clips and use a lint-free area. Never pour fixer down the drain without checking local rules — I store spent fixer to reclaim silver or have it disposed properly. Wear nitrile gloves, eye protection, and keep chemicals labeled. The first time I nailed a crisp, contrasty print I felt like I’d conquered a tiny chemistry-powered miracle; I still grin every time a dodge brings out hidden detail.

If you're thinking about turning a spare closet or basement corner into a place where prints slowly appear under a warm safelight, the good news is that the cost spectrum is huge — and that means you can totally tailor it to your budget and ambitions. I’ve built a tiny home darkroom for film and paper printing and later helped clean up a community lab, so I can say from experience there are two big cost buckets: startup (one-time equipment and buildout) and ongoing (chemicals, paper, maintenance). For a bare-bones DIY setup focused on developing 35mm/120 and making small prints you can get started for a few hundred dollars if you buy used gear and repurpose household items. A more comfortable mid-range setup with a decent enlarger, trays, proper sink, and ventilation sits in the low thousands, and a full professional-grade dedicated space with plumbing, extraction, brand-new large-format enlarger, drying cabinet, and custom benches can push into five figures. Breaking it down a bit: critical gear includes an enlarger, easel, lenses/contrast controls, trays and tongs, safelight, timer, and a sink or at least a way to rinse prints and film. Used 35mm enlargers often show up for $150–$600; new or pro models can be $800–$2,500. Trays, tongs, and basic tools are only $50–$200. Timers and safelights range $40–$200. If you need a dedicated sink and plumbing work, expect $200–$1,000 for a small install (DIY vs. plumber). Ventilation is important when working with chemicals — a simple window fan or small exhaust can be $100–$400, but a proper extraction system with ducting and installation can be several hundred to a couple thousand dollars depending on codes in your area. For darkroom furniture, shelving and counters can be DIYed for $100–$800; a drying cabinet or heated dryer adds $200–$1,500. If you want variable contrast or filters for your enlarger head that’s another $80–$400. Ongoing costs are pleasantly manageable or surprisingly steep depending on your output: chemistry sets (developer, stop bath, fixer) often cost $30–$100 per bottle concentrate and can process dozens to hundreds of prints/rolls depending on dilution and reuse. Boxes of paper vary wildly — $30–$80 per 100-sheet box for popular brands — and toners or special papers add expense. If you print casually, plan on $10–$50/month; if you print a lot or run a workshop, plan $100–$500/month. To save cash, buy used enlargers and trays, start processing film in a tank (it can be done in a bathroom sink), join a community darkroom for access without full build cost, or start with just film development and outsource printing until you can afford the enlarger setup. Also, vintage gear is plentiful and repairable, so you can get excellent results for far less than new pro equipment. All told, I’d ballpark the tiers like this: minimalist DIY home darkroom $300–$1,000; solid hobbyist darkroom (newer enlarger, basic plumbing, proper ventilation) $1,000–$4,000; full dedicated/pro lab $5,000–$20,000+. It’s less about the sticker shock and more about what you want to acheive — the first time you pull a print out of the developer and watch an image appear, the cost suddenly seems secondary. I still get a kick out of that slow reveal and would happily trade a weekend of streaming for a few hours under a red light any day.

Steam rising from the fixer and the click of the timer still give me goosebumps—there's a little theater in every darkroom session. I usually split my workflow into clear steps so I don't fumble in the dark: load the film onto a reel inside a changing bag or totally dark room; pre-soak the reel for a minute or two if the emulsion’s cold so temperature equalizes; mix developer to the recommended dilution and temperature (20°C/68°F is the common baseline); pour developer, time and agitate according to the developer’s guide; stop bath or a quick water rinse; fixer; wash; wetting agent; dry. For agitation I do a gentle initial inversion for about 30 seconds, then 5–10 seconds of gentle inversions every 30–60 seconds depending on the developer and film. That helps keep grain smooth and contrast even. For fixer I usually follow the manufacturer’s minimum time at the working temperature (often 3–5 minutes) and then use running water for at least 5–10 minutes, or a hypo clearing agent to speed things up. Finally I use a few drops of wetting agent in the final rinse and hang the negatives with clips in a dust-free spot. There are lots of variations: stand development, push/pull, different developers like D-76, HC-110, Rodinal or Ilford ID-11 each give distinct grain and tonal qualities. Over time I learned to keep notes—developer, dilution, temp, time, agitation—and that little notebook has saved countless rolls. It still feels magical watching the latent image bloom into silver tones, and I always grin when I see the first negative appear.