Silver Halide Darkroom Tools & Reference
3D Studio
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Everything happens in the dark

A working reference for film photography and darkroom practice — 28 tools across five stages, four interactive simulators, and three calculators that do the arithmetic for you.

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Independent reference

No shop, no affiliate links, no sponsored placement. Ever.

Nothing is for sale

Product names appear as reference points, not as advertising.

Four free 3D tools

Interactive simulators, no account, no download, no paywall.

Safety first

Chemistry handling, ventilation and waste disposal on every relevant page.

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Five stages, twenty-eight tools

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Camera & Film

The capture side — emulsions, formats and the hardware that holds them.

6 tools

Developing Chemistry

Developers, stops, fixers and the wash — the wet half of the process.

6 tools

Darkroom Equipment

Safelights, trays, timers and the small tools that make a room workable.

6 tools

Enlarging & Printing

From negative to paper — enlargers, lenses, papers and focus aids.

5 tools
The process

From exposed frame to finished print

  1. 1 Shooting stage illustration
    Step 1

    Shooting

    Expose the film. Emulsion choice, ISO, exposure and the frame itself.

  2. 2 Developing stage illustration
    Step 2

    Developing

    Chemistry reduces exposed silver halide to metallic silver — the latent image becomes visible.

  3. 3 Stop & Fix stage illustration
    Step 3

    Stop & Fix

    Halt development, then dissolve the unexposed halide so the image becomes permanent.

  4. 4 Enlarging stage illustration
    Step 4

    Enlarging

    Project the negative onto paper at the size you want, with the contrast you want.

  5. 5 Printing & Finishing stage illustration
    Step 5

    Printing & Finishing

    Expose, develop, wash, dry and archive the print.

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3D Studio

Four interactive tools, no download

Load film onto a reel in a changing bag. Run a tank through the full chemistry sequence. Focus an enlarger and watch the print appear. Analyse a photograph across eleven zones. Each one runs in your browser and falls back to a written guide if your device cannot render 3D.

Film LoadingDeveloping TankEnlargerZone System Open 3D Studio
Most used

Popular tools

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Camera & Film Shoot

35mm Film

The format that defined documentary photography — 36 frames on a 24 × 36 mm strip.

Shooting stage
Camera & Film Shoot

120 Medium Format Film

A wider negative on a spool, with backing paper instead of a cassette.

Shooting stage
Camera & Film Shoot

Large Format Sheet Film

One sheet, one image — the slowest and most deliberate way to expose film.

Shooting stage
Camera & Film Shoot

Film Cassette

A light-tight metal can with a felt light trap and a spool you can rewind.

Shooting stage
Camera & Film Develop

Developing Tank

A light-tight vessel that lets you develop film in full daylight.

Developing stage
Camera & Film Develop

Changing Bag

A portable darkroom that folds into a pocket — total darkness anywhere.

Developing stage
Developing Chemistry Develop

Film Developer

The reducing agent that turns exposed silver halide into visible metallic silver.

Developing stage
Developing Chemistry Stop & Fix

Stop Bath

A dilute acid that halts development in seconds and protects the fixer.

Stop & Fix stage
Developing Chemistry Stop & Fix

Fixer

Dissolves the unexposed halide so the image stops changing and can be seen in light.

Stop & Fix stage
Free calculators

Do the arithmetic, keep the craft

Exposure Calculator

Solve for the shutter speed at any aperture, ISO and filter combination.

Free tool5 outputs
Free tool Open
From the blog

Reading worth your time

All articles
Beginner 4 March 2026 9 min read

How to Start Film Photography: A Beginner's Guide

The four decisions that actually matter when you start — camera, format, emulsion and how you will get it developed — and the seven that do not.

Mira Halvorsen
Darkroom 18 February 2026 8 min read

Loading Film into a Developing Tank

The single most common failure in home development, why it happens, and the practice routine that makes it impossible.

Mira Halvorsen

Start with the 3D Studio

Four interactive simulators that teach the sequence, the variables and the mistakes — before you spend a roll of film or a sheet of paper finding out the hard way.

Open the 3D Studio