Re: Colour IR, some starting guidelines please.. -Reply

["Willem-Jan Markerink" <w.j.markerink@xxxxx>]

On 28 Mar 97 at 18:09, Timothy E. Coffer wrote:

> So, W-J, have you found that homebrew recipe for making color negs
> out of IE, yet? The idea of using a blank frame of color neg as an orange
> mask for printing purposes makes it closer to do-able. Any preferences
> for the "correct" shade of orange; ie, what brand of color neg works
> best?

Okay, since no other person stepped forward....:-))

Translated from Guenter Spitzing's "Moderne Infrarot- und 
UV-Fotografie" [1992], page 116-118; Dutch translated "Infrarood & 
Ultraviolet fotografie [1978]", page 98-100:


There are three reasons to prefer neg development over slide 
development:

1) Very easy and straight forward processing, almost as quick as b&w 
development 
2) Strongly filtered neg's result in a different set of colors than 
strongly filtered slides. An exactly equally strong filtering with 
neg's influences colors deviating or even opposite from the filtering 
color *more* than the same filtering does with slide film. Example: 
to obtain a strong bluecast in print, slide film requires 70 Magenta 
and 70 Cyan, whereas neg film requires 70 Yellow. Yet red and yellow 
colors are represented more strongly with straight-from-slide-prints 
than with neg-prints [Guenter mentions 'copies' instead of 'print', 
but that doesn't fit in with the rest of that chapter].
3) B&w prints are more easily obtained from neg's than from slides.


Two developing methods:
***************************

I) Tetenal Neofin 2
*******************
a) Neofin 2 developer: 15 minutes @ 20C
b) Rinsing: brief @ 18-20C
c) Fixing: 6 minutes @ 18-22C
d) Bleach-fix: 6 minutes @ 18-22C
e) Rinsing: 35 minutes

ad a) part I and part II diluted in 1000ml water
ad c & d) both according to kit instructions
ad d) re-use fix-bath and add red bleach powder
 
Up to 4 films can be developed this way (simultaneously).


II) Tetenal UK II (old) and UK 3 (new)
***************************************
Originally ment for Kodak Ektachrome 14RC paper, using only bath III 
(color developer) and bath IV (bleach-fix bath).

a) color developer: 15 (UKII) or 20 minutes (UK3) @ 20C
b) rinsing: brief @ 18-22C
c) bleach-fix: 8 minutes @ 18-22C
d) rinsing: 35 minutes

ad a) usual dilution of 1+3
ad b) according to kit instructions

In 2 liter developer and 1/2 liter bleach-fix up to 4 films can be 
developed (simultaneously).

General notes:
****************
- Compared to slide development, exposure index is 1-1.5 stops lower
- UKII/3 kit results in a slightly higher green fog, which makes for 
softer neg's.
- Since there is no orange mask present, it is recommended to ad a 
ME-filter (orange colored mask replacement) when printing.
- Another trick for experiments is direct printing of normal 
IR-slides on color-neg paper (again using ME-orange filter).


B&W printing of IR-color neg's
*********************************
When using panchromatic print paper (Kodak Panalure, Labaphoto 
Labalure), one can adjust the grey scale with additional filtering 
during printing (yellow filter used with actual film exposure):

a) Blue filter <=> unfiltered ordinary b&w image
b) No filter <=> yellow-filtered ordinary b&w image
c) Green filter <=> red filtered ordinary b&w image
d) Red filter <=> infrared b&w image

ad b) Although grey scale representation is equal to a yellow 
filtered ordinary b&w image, it has a little more contrast and far 
better haze penetration. So the color rendition of panchromatic film 
with the hazy penetration of IR-b&w film!

(last note from the author/translator: I hope someone feels the holy 
obligation to recalibrate all of the above for the new Ektachrome 
IR....;-))

(all this also now online on my homepage:
http://www.a1.nl/phomepag/markerink/mainpage.htm)
-- 
Bye,

       _/      _/       _/_/_/_/_/       _/_/_/_/_/
     _/  _/  _/               _/       _/  _/  _/
     _/  _/ illem    _/     _/ an    _/  _/  _/ arkerink
                     _/_/_/  



      The desire to understand 
is sometimes far less intelligent than
     the inability to understand


<w.j.markerink@xxxxx>
[note: 'a-one' & 'en-el'!]

------------------------------