*Due to the chemicals in this product, it is available for in-store pick up only. HARMAN WARMTONE DEVELOPER is a liquid concentrate suitable for the dish/tray developing of all RC and FB black and white photographic papers, giving a warmer image tone to most papers. Used at a dilution of 1+9 it is clean working and has excellent keeping properties. We do not recommend its use for high temperature or machine processing applications. Not suitable for developing films.