This 1L bottle of Moersch Photochemie ECO 4812 is a concentrated black & white paper developer designed for both resin-coated and fiber-based paper types. This flexible developer solution achieves a high Dmax and low base fog, along with a well-separated shadow range and long tonal scale for accurate results. The standard dilution is 1:14, however dilution can be adjusted to alter the print contrast and developing times, and to suit various paper types. The stock solution has a long shelf life of four years when unopened, and a working solution has a shelf life of approximately eight months.