Ilford PQU Developer 1 Liter is a liquid development concentrate suitable for dish/tray development of all RC and FB black and white photographic papers. PQU has excellent shelf life and provides a slightly warm image tone when used with the most black and white darkroom paper. The developer comes as a concentrate and is usually diluted 1 + 9.
If you need a fast-working developer that makes for a lot of contrast and does not need a high degree of magnification, PQU can also be used for dish/tray processing of technical films such as Ilford Ortho Copy Plus, as well as some photographic film sheets.
