Re: Developing Konica IR-750

[eml@xxxxxxxxx]

You might want to try Microdol-X or, interchangeably, Microphen,
diluted 1:3 at 25C for maybe 8 to 9 minutes.  I found that this 
produces excellent negatives which print easily and with good 
effective film speed.  Of the two, Microphen  will deliver about
1/3 to 1/2 stop more speed with no difference in gradation or grain.

As this film is very slow, a slight but meaningful increase in
speed can be gained by immediately following development in an 
alkaline bath, with no rinsing inbetween.  The one that I use
for this purpose with many different films  is the "B" solution
from the original (1927) Leica Divided Developer.  It consists
of:

Sodium Sulfite (Anhydrous)        6 Grams
Sodium Carbonate (Anhydrous)     15 Grams
Water (cool)                    1.0 Litre

This is poured in the tank immediately after the devekoper
is poured out.  Agitation is continuous for three minutes.
Then wash with plain water, as an acid stop bath might cause
CO2 bubbles in the emulsion, and fix normally.  With all
films this gives a useful boost in shadow detail with little
or no difference in highlights and little change in grain
structure.  The effect is generally worth maybe another 1/3
to 1/2 stop, and generally leads to a beneficial increase in 
deep shadow sensitivity and contrast while having little effect 
on highlights.

Hope this helps,

Edward M. Lukacs, LRPS
Washington, DC, USA     



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End of Infrared-Digest V0 #127
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