Tri-X Pan 400 is the old 35mm/roll-film formula,
Tri-X Professional 320 is the old roll-film/sheet film formula it has/had a gelatin retouching surface on the back of the film.
Tri-X Professional 400 is the current film that replaces both of the former
ones. It supposedly has an entirely new emulsion and is produced on new
machinery in a new plant. I have never used this pro-400 stuff.
So they are in fact all at least slightly different films.
graywolf
http://www.graywolfphoto.com
"Idiot Proof" <==> "Expert Proof"
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Don Sanderson wrote:
I see Tri-X packaged as "Tri-X Pan" and "Tri-X Professional".
I assumed there was no real difference as I've also seen it
advertised as Pro when the package said Pan and the other
way around.
Talking strictly about the ISO 400 flavor here.
Kodak only lists the Pro on their web site as near as I can tell.
Here's the rub: The Pan version data sheet says 8 minutes at
68 degrees F in D-76 while the Pro version calls for 6 3/4
minutes at 68, also in D-76. Both at 1:1.
Here's a link to the D-76 data sheet that shows 4 flavors of Tri-X
at 3 different development times at 68 degrees:
http://tinyurl.com/89frp
Does anyone have the answer to this riddle?
Why the rather large difference in soup times?
TIA
Don
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