Negatives developed in PRESCYSOL EF, particularly using the partial stand method, will yield full speed, exhibit high acutance, and will need considerably less burning-in to areas such as skies. As development proceeds, oxidation and natural by-products of the process stain the emulsion brown, the staining being proportional to the exposure level of the various parts of the negative. The result is a continuously variable mask of printing density across the tonal range of the negative. Further, as the emulsion is stained mostly between the silver grains the effect is to soften the grain and so produce a smoother tonality in large areas such as sky and mist, where grain can normally be such a problem. PRESCYSOL EF is an extremely tolerant developer - films of different make and speed can be developed together at the same time. For example, HP5 400 (120 roll film) and Delta 100 (35mm) despite being of totally different grain structure can be developed together in the same tank for the same time. In fact, the modern tabular grain films (which require closer control of times and temperatures in normal developers and are more susceptible to burned highlights and blocked shadows) will benefit enormously from being developed in PRESCYSOL EF, yielding the fine grain, tone and acutance of which these films are capable.

This quantity is sufficient for up to 33 rolls of 35mm film, or 40 rolls of 120, film (if the 120 film is loaded two rolls to a spiral).