Kodak Professional BW400CN is a high-speed chromogenic black and white negative film designed to be processed in C-41 chemistry and printed on RA-4 color papers. While designed within a color process, the film offers smooth and neutral black and white tonality with notable highlight and shadow detail. It has a nominal sensitivity of ISO 400/27° and features Kodak's T-GRAIN emulsion for high sharpness and a very fine grain structure. The film is especially well-suited to portrait and wedding photography, as well as commercial and general use applications. It is intended for exposure under daylight-balanced lighting, however can be exposed under other light sources without filtration.