Getting back to some of the comments, and questions:
This is not a scanning effect, the colouration is obvious in the
negatives. To my eye it looks purple. It is not a small effect. It is
easy to pick the "good" frames.
The effect covers the whole frame but does not extend beyond the frame.
I have not seen any images where the effect covers only part of the
frame, which is what I would expect with a chemical contamination /
degradation. The effect is also not position in the strip related.
I don't think this is filter related. I don't even think the relative
owned any filters. There are examples of shots taken not long apart,
similar views on adjacent frames where one has yellowed and the other
has not.
Finally I have a vague memory of having seen some of these images as
photo album prints with neutral colours, so either the mini-lab printer
was able to colour correct, or the effect was smaller when just developed.
Richard Urmonas
On 2021-10-25T08:57:38.000-07:00, Ken Hart <kwhart1@xxxxxxxxxxxxxxx>
wrote:
I want to agree with what someone else (I've lost track of who!)
suggested: what the original poster is seeing is an artifact of the
scanning software. I've seen this myself when scanning color negatives.
My flatbed scanner can scan two strips of negatives. It will try to pick
the best overall filtration for the entire strips. If one negative is
off exposure by a bit, the filtration will go all wonky. Even if I
select individual frames for scanning, if the exposure is off, it can
have trouble with the color. That's why I'm going to be spending the
next couple days in the darkroom instead of on the computer!
Ken Hart
kwhart1@xxxxxxxxxxxxxxx
On 10/25/21 11:01 AM, `Richard Knoppow wrote:
The yellow mask is in all color negative materials. Its purpose
is to
correct for spurious transmission of certain of the dyes that
make up
the image. The built-in mask was invented by a fellow at Kodak
(you
know I have trouble with names). In this process the dyes are
colored
to begin with and the color is changed in proportion to the
development. If you examine a color negative through a magnifier
you
will see that the mask disappears where certain colors appear,
thus,
there is what amounts to a positive mask image along with the
negative
printing image. The colored dye mask results in an amber color to
unexposed parts of the film. I don't think that is what is being
seen
here because it is consistent in all parts of the film.
On 10/25/2021 7:15 AM, BOB KISS (bobkiss) wrote:
DEAR RICHARD,
Perhaps I am missing something obvious but do I recall
correctly that
color C-41 negatives all have that yellowish/orange cast to
make
printing easier, requiring less filtration?Kodak referred to it
as
"the mask".I only used C-41 black and white film once (because
I
hated the results) so I don't recall if it had the same overall
cast.
CHEERS!
BOB
-----Original Message-----
From: pure-silver-bounce@xxxxxxxxxxxxx
[pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of `Richard
Knoppow
Sent: Sunday, October 24, 2021 8:59 PM
To: pure-silver@xxxxxxxxxxxxx
Subject: [pure-silver] Re: Yellow colouration in C-41 negatives
Is the yellow all over the negative, I mean up to the edges
rather than just the image area? I am looking for clues. Can
you
tell if its on the emulsion side or the support side? The
question is whether its actually some sort of flare. Old
Kodachrome slides and prints often had a yellow color from the
lacquer on them. Two kinds of lacquer, one came off with a mild
alkaline solution like print developer, the other with a
solvent
but I don't remember what. I think that is unlikely here
because
it would be all over the film.
Is this color or stain uniform?
On 10/24/2021 1:01 PM, Richard Urmonas wrote:
While not strictly silver I was hoping someone could shed some
light on a yellow colouration on C-41 negatives. I "inherited"
the negatives from a family member so I do not know the
history
of development and storage, but expect these were processed by
a local 1 hour lab and then stored in a drawer for a number of
years. From the contents I think these date from the 1990s.
The issue I am observing is a yellow colouration across the
whole frame, like a yellow filter was used. This seems to have
happened on random frames and can affect a single frame to 3
or
4 in a row but then have "good" frames. There is even a case
where 2 frames apparently taken a short while apart have one
with the yellow colouration and the other looking fine. Note
that the yellow colour is on the positive image from my
scanner. The colour shift can be seen on the negative. This
only affects some films, others which have been stored
together
with the affected films show no issue. I would have suspected
some colour fading effects, but this does not explain the
whole
frame being affected. Can anyone shed some light on what might
be going on?
Thank you,
Richard Urmonas
=============================================================================================================
To unsubscribe from this list, go to www.freelists.org
[//www.freelists.org] and
logon to your account (the same e-mail address and password
you
set-up when you subscribed,) and unsubscribe from there.
--
Richard Knoppow
dickburk@xxxxxxxxxxxxx
WB6KBL
=============================================================================================================
To unsubscribe from this list, go to www.freelists.org
[//www.freelists.org] and logon to
your account (the same e-mail address and password you set-up
when
you subscribed,) and unsubscribe from there.
=============================================================================================================
To unsubscribe from this list, go to www.freelists.org
[//www.freelists.org] and logon to your account (the same
e-mail address and password you set-up when you subscribed,) and
unsubscribe from there.
