Silver Halide Darkroom Tools & Reference
3D Studio
6 tools

Developing Chemistry

The chemistry that turns a latent image into a permanent one. What each bath does, how to dilute it, how long it lasts and how to handle it without hurting yourself.

2Developing3Stop & Fix
Developing Chemistry illustration

About this category

The chemistry that turns a latent image into a permanent one. What each bath does, how to dilute it, how long it lasts and how to handle it without hurting yourself.

How these pages are written Specifications come from published manufacturer documentation. Development times are stated for a small inversion tank at 20 °C. Always treat them as starting points and confirm against the data sheet for your own materials.
Wear PPE & Ventilate Nitrile gloves Eye protection Cross-flow air Label every bottle Dispose of fixer properly
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
Developing Chemistry Stop & Fix

Wetting Agent

One drop in the final rinse and the water stops forming droplets on the film.

Stop & Fix stage
Developing Chemistry Develop

Developer Working Solution

The diluted, ready-to-use developer — mixed once, used once, poured away.

Developing stage
Developing Chemistry Stop & Fix

Hypo Clear

A washing aid that swaps the fixer out of the emulsion so the wash can finish the job.

Stop & Fix stage
Other categories

Keep browsing

Camera & Film

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

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