darkTimer
A black-and-white film development timer with dilution mixing math, audio cues, and timed agitation prompts.
- Select your film, developer, dilution, tank capacity, and push/pull to calculate the developer and water mix.
- Pick a recipe and adjust the time if needed for your temperature or process.
- Press Start development: agitate continuously for the first minute, then 10 seconds at the top of each minute until the completion alert sounds.
About these times
Live recipes come from 35mm.org and retain their ISO, temperature, format, confidence, and original source. If the API is unavailable, darkTimer uses its smaller manufacturer-sourced offline catalog. Always confirm the source before processing important negatives.