|Alternative Printing and Chemistry|
Rollo-Pyro (for rotation development)
formula according to Gordon Huchings
formula accordng to Harald Leban
Pyrogallol is a colouring developer substance.|
Proportional to the amount of reduced silver a yellowish-green
stained image emerges which covers(masks) the grain and increases
the print density as well.
For alternative processes - like platinium print-
which are exposed to light containing a large amount of UV-rays the stained
image enhances the contrast.
This is one of the reasons for a lot of practising
alternative photographers to use Pyrogallol (PMK) as a
This way you can have the best of both worlds:
negative where you can easily produce enlargements or contact prints
and you can also make excellent platinium prints.
Thus the complicated
production of special high contrast negatives becomes unnecessary.
But Pyrogallol has even further attractive qualities:
Pyro-negatives have a high acutance and show very finely and distinctly
defined differences in the tonal range.
This is especially important when
photographing in opposite light. The lights are very differenciated,
shadows show a lot of detail, medium tones are clearly visible.
|Net prices excl. V.A.T. in €|
| 0,75 litre || 25,00
| 0,75 litre || 23,00
| 0,75 litre || 26,50
| 0,75 litre || 24,00