All the people I've asked in various forums, using concentrated solutions.
But a careful reading on the use of development in double bath, I was struck by this indication.
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... This system enables a development almost automated irrespective of the duration and temperature (*). The duration is unimportant because in the first bath, it simply requires that the gelatine to soak in development; this requires a few of minutes and after any added time does not change anything. Is however necessary to be within reasonable limits to avoid the formation of veil: the duration of 3 or 4 minutes is optimal in each case. the duration of the second bath is of no importance to the fact that during this exhausting goes by itself the energy development; also it takes a few minutes, and then, as the limit of safety, it may take as long as 3 or 4 minutes.
A perfect adjustment of contrast, density and penetration of the shadows derives from the merger of the two bath (!!!).
The first bath, containing the developer agent, in concentrated solution and the second bath containing the alkali, in a diluted solution produces a lower penetration in the shadows and more veil, but also a finer grain; the first bath diluted and the second bath concentrate, returns the maximum richness of detail in the shadows, the total absence of the veil, but a coarser grain.
By varying the relative concentrations adroitly you have a precise system to adjust with accuracy the results according to the wishes and needs, without take into account the duration of development or the degree of agitation of the bath.
(*) Needs to be done except with the agents detectors that also exert an alkali development (metol,); in this case the duration of the first cycle affects the results. To prevent the metol develop its action in the first bath, it will be sufficient to keep the solution at a temperature not exceeding 10 °C.
Here in APUG anyone knows this technique? Personally, often using double bath and so this technique intrigues me! ! !
