I doubt it will work. Usually reversing a film requires a
stronger than normal developer. C-41 uses PPD derivatives that aren't
particularly aggressive.Perhaps if you added a little hydroxide and
flashed the film during the development but I'm not at all sure how
this would work.

Regards,

  John S. Douglas, Photographer -  http://www.puresilver.org
             Please remove the "_" when replying via email

I've never tried Techpan in C-41 developer, but I tried some Tri-X (120
size) once. My goal at the time was to elimate some chemicals from my
darkroom, and I use far more C-41 and RA-4 than B&W. I used the time and
temp for d76. The result was a fairly low contrast neg, probably would have
required 2 full grades higher contrast paper than if I had used D-76, but
for Techpan this would be desireable, no?

(BTW, the C-41 fixer works just fine, and the Stabilizer seems to be OK as a
sub for PhotoFlo. I imagine the Bleach would do a good job of completely
ruining the B&W neg!)

As for mixing the concentrate: the Flexicolor C-41 developer I buy is
supplied in 3 parts to be mixed with water. The 3.5 gallon size kit has
about 32 ounces of part 'A' and four ounces of parts 'B' & 'C' to be mixed
with three gallons of water. I don't know of any other mixing dilution
method.

Isn't this however a moot point? Techpan is no more, right?

Ken Hart

  I think you have to try it. Reversal films need to be
developed to higher contrast than negative films. Since Tech
Pan and similar high contrast microfilm materials are
inherently high contrast this is, at least, possible.
  Reversal first developers for B&W usually have a small
amount of a halide solvent in them. Some use hypo, others
use sodium thiocyanate, a more powerful solvent. The purpose
is to remove very insensitive halide particals which
otherwise will be redeveloped in the reversal developer and
veil the highlights. The amount of this solvent must be
determined by experiment.