In article ,
Richard Knoppow wrote:

I don't think Kodak ever just re-writes datasheets for
no reason. However, since the development charts are based
on sensitometric measurements and since these measurements
are made on a continuing basis for tracking the production
quality, its quite possible that at some point there is
enough change to warrant new overall measurements and an
amended datasheet.

I am a little surprised to see Kodak actually rewriting datasheets
at all any more, and I wonder if they are using an outside contractor
as they do for a number of other technical services they used to handle
in-house. Have a look at the big rotary-processing table in J-109
(the Xtol datasheeet) and you'll see clear evidence they stopped work
on that document in the middle -- the entries in the table for new
Tmax 100 ("100TMX") are mostly left empty, and the values which are
present are highly suspect (almost everything else in the table I have
checked matches my measurements very closely; the 100TMX times, as far
as I can tell, are just wrong).

Speaking of J-109, for EI 400, Kodak has the same row of numbers for
"old" and "older" TMY the

XTOL STOCK 1:1
65=7.5 68=6.25 70=5.25 75=4 68=8.25 70=7.25 75=5.75 80=4.75

Now, F-32 (the "oldest" TMY datasheet) has:
XTOL STOCK 1:1
68=6.25 70=5.5 72=5 75=4 68=8.25 70=7.25 72=6.75 75=5.75

The only difference is at 70F, and from other data in the charts (the
data for "old TMX") one can deduce that actually this data point must
just be about half way between 5.5 and 5.25, as different Kodak charts
list it as one or the other consistently.

F-4016 (the "old" TMY datasheet) has:
XTOL STOCK 1:1
68=6.25 70=5.5 72=5 75=4 68=8.25 70=7.25 72=6.75 75=5.75

F-4043 (the "new" TMY datasheet) has:
XTOL STOCK 1:1
65=7.25 68=6.5 70=6.25 72=5.75 75=5.25 65=10.75 68=9.25 70=8.5 72=7.75 75=7

I was wrong: these are *not* the times from F-32 (which were almost exactly
the same times as F-4016, the only difference being the one noted above).
I think I confused myself last night because the numbers in the F-4016
table do not include 65F, so my data were off by one column. These are a
whole new set of times.

Here is an interesting and perhaps useful fact -- if you trust the numbers
for 100TMX from J-109/F-4016, which I personally do not (see above): at 68
and 70F the new 400TMX times are only 15 seconds off the new 100TMX times,
for XTOL 1:1, D-76, and HC-110 -- it may be that Kodak has deliberately
retuned 400TMX so that 100 and 400 can once again be run in the same tank
in commercial applications. However, this will most assuredly not work
with TMAX RS or XTOL stock -- the data are all over the chart for those
two.

--
Thor Lancelot Simon

"The inconsistency is startling, though admittedly, if consistency is to
be abandoned or transcended, there is no problem." - Noam Chomsky