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WARMTONE DEVELOPER is a liquid concentrate hydroquinone developer suitable for the dish & tray developing of all black and white photographic papers both resin coated (RC) and traditional fibre based (FB). It is used at a dilution of 1+9. WARMTONE developer is clean working, has excellent keeping properties and gives a warmer image tone to most papers. WARMTONE developer is designed for use at ambient room temperatures, nominally 20°C / 68°F. We do not recommend its use for high temperature or machine processing applications. It is not suitable for developing films