Hydroquinone COA

Hydroquinone is an important organic developer. It develops more slowly than metol, but once the image appears, density increases rapidly, resulting in high contrast. Development is fastest at 27°C to 29°C; below 15°C it slows down, and below 5°C it almost stops. Using a higher concentration can produce warm-toned images. It is used as a standard photographic developer, as well as a physical developer and redeveloper.

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