Kodak D-76 is a powder developer for black and white film, a sachet making 1 litre of working solution. The best-known formula in black and white photography.
What it is for
In the post-war world Western photojournalists developed in D-76, Britain used Ilford ID-11, Eastern Europe used F-19 — and all of them are built on the D-76 recipe. Ask an American photographer which developer is "theirs" and half the answers end with "…or D-76". Universal, simple and predictable: it gives good results with any black and white film. Contrast runs a little higher than in fine-grain developers, and the grain shows a little more.
How to dilute it
The solution is replenishable — kept and reused, with development time extended as it exhausts. Keep count of the films put through it; that is the only way to avoid an underdeveloped roll at the end of its life.
Storage
Sealed powder keeps for years; mixed solution keeps far less well, so mix what you will use. Dissolve at the stated temperature and in the stated order — getting the order of components wrong ruins a developer more reliably than any timing mistake.
How it compares
The benchmark everything else is measured against. Dedicated fine-grain developers give finer grain and high-acutance formulas give more bite, but D-76 remains the zero point everyone counts from. If you are learning to develop, start here.
