Richard Knoppow (dickburk@ix.netcom.com)
Sat, 17 Apr 1999 01:27:06 -0700
At 09:15 PM 4/16/99 -0700, you wrote:
>Additionally, there is a question regarding the longevity of color negs and
>expecially the T-Max CN 400 also a C-41 processed negativ.
>
>Any input on this?
>
>S. Shapiro
Yup, T-Max CN400 is a chromogenic film. The image is made of dye rather
than silver despite being monochrome. It has the same problems with
permanence that color films of all types have, namely that dyes are
fugitive to varying extents. Some dye materials reportedly have long lives
but, in general, silver or silver is going to be longer lasting.
Silver images on negatives are generally less vulnerable to degradation
than prints since film is much coarser grained than printing paper.
Degradation of the image on a chromogenic B&W film is less serious than
that of a color image as far as being able to recover the image by
printing. Nonetheless, chromogenic film is not the best choice for image
permanence.
----
Richard Knoppow
Los Angeles,Ca.
dickburk@ix.netcom.com
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