lev29 Loc: Born and living in MA.

So when did you castrate this individual?

lev29 Loc: Born and living in MA.

COLOR NEGATIVE DETERIORATION

As I have received no replies to the above question, perhaps because it was buried in the middle of my reply to another Hog, I went ahead and used Google.com with the Search phrase: deterioration of color negatives . Based on my review of the search results, I consider the following 3 URL's to be the most pertinent.

http://cool.conservation-us.org/byauth/messier/negrmcc.html

http://psap.library.illinois.edu/format-id-guide/negative

http://archivingnegatives.wordpress.com/deterioration/


From the above I found two informative .pdf files with their URL's given below.
http://www.nedcc.org/assets/media/documents/05PH_01FilmBaseGuide.pdf

The National Park Service provides a chart to compare nitrate (cellulose nitrate) and safety (cellulose acetate) negative film deterioration:
http://www.nps.gov/museum/publications/conserveogram/14-09.pdf


The following are merely definitions of the components of film negatives. I have not thoroughly assessed (yet) all of this information in order to determine how the deterioration of Color Negative Film (which is synonymous with 'Chromogenic Process Negative',) changes in appearance over time.

Evidently, the film bases that were developed, in chronologic order, were Cellulose Nitrate (inflammable), Cellulose Acetate, and lastly, Polyester. According to one reference, Kodak was the only film manufacturer in the U.S. that kept records of their film composition batches.

One of the links gives the following information:

Deterioration
Chromogenic negatives will fade, even in dark storage. Cold storage will slow the rate of deterioration. Much like chromogenic prints, negatives prior to the 1980s may discolor as a result of severe thermal fading of the cyan dye and poor storage in high temperatures. Unlike other processes, the progression of color negative stability is linear as coupler staining and dye stability have gradually improved over time. Deterioration of the film support varies depending on the type of plastic used.

Acetate: Cellulose acetate film is susceptible to vinegar syndrome, causing the film base to shrink and the gelatin emulsion to pull up in folds. A strong vinegar odor is a telltale symptom in later stages of deterioration. Acetate deterioration is accelerated by humid conditions.

Polyester: Polyester film is inert, considered archival, and has a life-expectancy of 500+ years under proper storage conditions.

Risk Level
Acetate: moderately high; polyester: moderately low. Chromogenic process negatives image material is especially sensitive to light and humidity, but it will gradually deteriorate even under good (dark, dry) storage conditions.

Acetate film is at a moderately high to high risk and should be monitored closely for signs of deterioration. Polyester film poses less of a risk, but it will still suffer from image fading.

If anyone would care to expand on the above or has time to search for a source that ultimately answers question D, I would appreciate it.
If this is my last post on this thread, I want to thank all of you who participated.
lev29 :thumbup: :D 8-)

Rongnongno Loc: FL

YOU are alive!!!!! A long time has passed since I saw you post!!! :thumbup: :thumbup: :thumbup: