HARMAN WARMTONE is a liquid concentrate developer suitable for dish/tray developing all traditional black & white darkroom papers. With excellent keeping properties, HARMAN WARMTONE uses a dilution of 1+9 to give prints a stunning look with warmer blacks and creamy highlights that enhance the look of darkroom prints. We do not recommend its use for high temperature or machine processing applications. This product is not suitable for developing films. For development times and developer capacities, please refer to the technical data sheet.