brucep
9-Jun-2014, 08:21
On the Pyrocat HD website, under suggested developing times there is the following paragraph:
Contrast Index
These times, at the temperatures indicated, should give an approximate CI of .56 when measured with a densitometer in blue mode, appropriate for printing on graded silver papers of #2 contrast. For variable contrast silver papers be sure to increase development times by about 35%.
Can someone explain why variable grade paper requires an extra 35% over a #2 paper, as printing through a #2 grade filter surely requires the same contrast of negative?
Thanks
Bruce
Contrast Index
These times, at the temperatures indicated, should give an approximate CI of .56 when measured with a densitometer in blue mode, appropriate for printing on graded silver papers of #2 contrast. For variable contrast silver papers be sure to increase development times by about 35%.
Can someone explain why variable grade paper requires an extra 35% over a #2 paper, as printing through a #2 grade filter surely requires the same contrast of negative?
Thanks
Bruce