Thanks Tom, that makes sense. Don
> -----Original Message----- > From: Graywolf [mailto:[EMAIL PROTECTED] > Sent: Saturday, June 25, 2005 12:49 PM > To: pentax-discuss@pdml.net > Subject: Re: OT: Tri-X question for you B&W shooters. > > > 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" > ----------------------------------- > > > 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 > > > > > > > -- > No virus found in this outgoing message. > Checked by AVG Anti-Virus. > Version: 7.0.323 / Virus Database: 267.8.1/28 - Release Date: 6/24/2005 >
