Thanks Godfrey, the data sheet makes it worse by listing Tri-X Pan, and Tri-X Pan Professional as the same dev. time and Professional Tri-X 400 as a seperate item at 6 3/4 minutes. I guess the word "Pan" is the key to the older consumer film.
Don > -----Original Message----- > From: Godfrey DiGiorgi [mailto:[EMAIL PROTECTED] > Sent: Friday, June 24, 2005 6:51 PM > To: pentax-discuss@pdml.net > Subject: Re: OT: Tri-X question for you B&W shooters. > > > Dredging out of my memory of film things, Tri-X Pan was the standard, > normal, consumer film you found in most photo stores. Tri-X > Professional had a softer gamma curve with a longer toe region. > They're similar but different emulsions. > > Godfrey > > > On Jun 24, 2005, at 4:34 PM, 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 > > > > >
