Negative curl... widthwise not lengthwise...

My negatives seem to have quite a curl to them after drying. I'm
wondering if this is normal? or if there is something I'm doing wrong.
The curl is not lengthwise like I would have somewhat expected because
the films has spent so long rolled up. It is curled widthwise. ??
Very strange. The negatives I get back from the photostore are always
flat. anyone know what I'm doing wrong? Thanks.

In article .com,
"Jed Savage" wrote:

My negatives seem to have quite a curl to them after drying. I'm
wondering if this is normal? or if there is something I'm doing wrong.
The curl is not lengthwise like I would have somewhat expected because
the films has spent so long rolled up. It is curled widthwise. ??
Very strange. The negatives I get back from the photostore are always
flat. anyone know what I'm doing wrong? Thanks.


Could be the film type, or too much heat or too heavy of a clip
weight on the center at the bottom of the drying film.
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to the American public."--Theodore Roosevelt, May 7, 1918

"Jed Savage" wrote

My negatives seem to have quite a curl to them after drying ... widthwise. ??

Efke film does this. The cause is a lack of a backcoat - a thin layer of
gelatin on the back of the film that curls the other way so the result
is a flat negative.

How to uncurl it? No idea. I just don't use Efke anymore.

--
Nicholas O. Lindan, Cleveland, Ohio
Consulting Engineer: Electronics; Informatics; Photonics.
Remove spaces etc. to reply: n o lindan at net com dot com
psst.. want to buy an f-stop timer? nolindan.com/da/fstop/

"Jed Savage" wrote

My negatives seem to have quite a curl to them after drying ... widthwise. ??

Efke film does this. The cause is a lack of a backcoat - a thin layer of
gelatin on the back of the film that curls the other way so the result
is a flat negative.

How to uncurl it? No idea. I just don't use Efke anymore.

--
Nicholas O. Lindan, Cleveland, Ohio
Consulting Engineer: Electronics; Informatics; Photonics.
Remove spaces etc. to reply: n o lindan at net com dot com
psst.. want to buy an f-stop timer? nolindan.com/da/fstop/

"Jed Savage" wrote

My negatives seem to have quite a curl to them after drying ... widthwise. ??

Efke film does this. The cause is a lack of a backcoat - a thin layer of
gelatin on the back of the film that curls the other way so the result
is a flat negative.

How to uncurl it? No idea. I just don't use Efke anymore.

--
Nicholas O. Lindan, Cleveland, Ohio
Consulting Engineer: Electronics; Informatics; Photonics.
Remove spaces etc. to reply: n o lindan at net com dot com
psst.. want to buy an f-stop timer? nolindan.com/da/fstop/

"Jed Savage" wrote in message roups.com...
My negatives seem to have quite a curl to them after drying. I'm
wondering if this is normal? or if there is something I'm doing wrong.
The curl is not lengthwise like I would have somewhat expected because
the films has spent so long rolled up. It is curled widthwise. ??
Very strange. The negatives I get back from the photostore are always
flat. anyone know what I'm doing wrong? Thanks.

I recently had the same problem with some 120 film I got developed.
The edges curl up when the emilsion side is down. This is the opposite
curl than what normally happens with 35mm. The trouble is that there
is not enough of an edge to hold it flag in the enlarger as there is
with the 35mm. It makes it impssible to print since my neg holder does
not flatten it even when it is in the enlarger. Any ideas how to
correct this post development? It is Ilford B&W print film.

"Jed Savage" wrote in message roups.com...
My negatives seem to have quite a curl to them after drying. I'm
wondering if this is normal? or if there is something I'm doing wrong.
The curl is not lengthwise like I would have somewhat expected because
the films has spent so long rolled up. It is curled widthwise. ??
Very strange. The negatives I get back from the photostore are always
flat. anyone know what I'm doing wrong? Thanks.

I recently had the same problem with some 120 film I got developed.
The edges curl up when the emilsion side is down. This is the opposite
curl than what normally happens with 35mm. The trouble is that there
is not enough of an edge to hold it flag in the enlarger as there is
with the 35mm. It makes it impssible to print since my neg holder does
not flatten it even when it is in the enlarger. Any ideas how to
correct this post development? It is Ilford B&W print film.

"Jed Savage" wrote in message roups.com...
My negatives seem to have quite a curl to them after drying. I'm
wondering if this is normal? or if there is something I'm doing wrong.
The curl is not lengthwise like I would have somewhat expected because
the films has spent so long rolled up. It is curled widthwise. ??
Very strange. The negatives I get back from the photostore are always
flat. anyone know what I'm doing wrong? Thanks.

This is pretty much normal. The curl is from the difference in
shrinkage of the emulsion and the support. Most film has a gelatin
back coating to compensate the curl but it is never completely
effective. Curl will vary with the amount of moisture in the air. In
very dry weather the gelatin shrinks more so the film will curl more.
Sometimes hanging the film with a weight at the bottom will straighten
it. Sometimes just leaving it exposed to the air will reduce the
curling. Even those very flat negatives from the photofinisher will
sometimes curl up if the weather is right.

Richard Knoppow
Los Angeles, CA, USA

"Jed Savage" wrote in message roups.com...
My negatives seem to have quite a curl to them after drying. I'm
wondering if this is normal? or if there is something I'm doing wrong.
The curl is not lengthwise like I would have somewhat expected because
the films has spent so long rolled up. It is curled widthwise. ??
Very strange. The negatives I get back from the photostore are always
flat. anyone know what I'm doing wrong? Thanks.

This is pretty much normal. The curl is from the difference in
shrinkage of the emulsion and the support. Most film has a gelatin
back coating to compensate the curl but it is never completely
effective. Curl will vary with the amount of moisture in the air. In
very dry weather the gelatin shrinks more so the film will curl more.
Sometimes hanging the film with a weight at the bottom will straighten
it. Sometimes just leaving it exposed to the air will reduce the
curling. Even those very flat negatives from the photofinisher will
sometimes curl up if the weather is right.

Richard Knoppow
Los Angeles, CA, USA

"Jed Savage" wrote in message roups.com...
My negatives seem to have quite a curl to them after drying. I'm
wondering if this is normal? or if there is something I'm doing wrong.
The curl is not lengthwise like I would have somewhat expected because
the films has spent so long rolled up. It is curled widthwise. ??
Very strange. The negatives I get back from the photostore are always
flat. anyone know what I'm doing wrong? Thanks.

This is pretty much normal. The curl is from the difference in
shrinkage of the emulsion and the support. Most film has a gelatin
back coating to compensate the curl but it is never completely
effective. Curl will vary with the amount of moisture in the air. In
very dry weather the gelatin shrinks more so the film will curl more.
Sometimes hanging the film with a weight at the bottom will straighten
it. Sometimes just leaving it exposed to the air will reduce the
curling. Even those very flat negatives from the photofinisher will
sometimes curl up if the weather is right.

Richard Knoppow
Los Angeles, CA, USA