This might sound like a rather simpleton type of question, but how long can one reasonably expect a routinely developed, properly washed negative to last? On another forum a poster was asking how to clean some old family negatives, and one reply was to simply digitalize them, and update the digitial file every couple of years, and not bother much with the cleaning and archival storage of them, since they would ultimately crumble to dust.
I took exception to that reply, but am not entirely sure how to refute it, or even if I should. A properly cleaned, archivally stored negative or slide...should we be thinking in terms of centuries, or just several decades?
I appreciate that the dyes in color transparencies would fade quicker, but a B&W negative would have much more staying power, wouldn't it? How long can we expect our negatives to survive?
Yeah - a real nice question ! In short : It is much more depending to the circumstances of archievement (conditions) dew point in the athmosphere(air humity), contant temperatures a.s.o. as one could imagine.
You will need a computer monitored high tech archive to reach all parameter.
By the time : How long will it last with digital storage? Billions of years or lets say : FOREVER !!!!





..fine !
Because of what reason ? Because you can make a copy from a copy from a copy and so your medium will survive forever.
In theory in practice your CD ist out of order within 6 month (without a copy

)
Yout DVD is broken the copy is lost within
3 years. Your portable device is stolen (with all private photographs of a full decade in it - sure you have no copy)
Well the nude pictures of your secretary (from secret holyday last year) were also
on it? Oh no - hope the police will not find your portable and give it back to your wife

...
So in short digital pictures are not save at all. Just in theory the are FOREVER (Nasa missed construction plans of Saturn V ....




due to digital storage? )
In practice with films archive experts stated : Color Films and Prints are not archievable in general !!!


Thats terrible - why is this so ?
Because they found out colors are not stabile for min. 100 years

Bw they rated as archivable and with special methods they give bw fims an prints min. 150 years.
Kodak stated 200 years ????
But to us at home lets guess (with minimum Gold archievement conditions)
- E6 Films 25 - 30 years with tollerance
to very little color lost/shifts
35 - 50 years with color shifts
50 - 70 years with massive color lost/shifts
over 70 - 80 years just bw - no colors remaining.
- K14 Films (Kodachrome)
35 - 50 years with no noticable lost of colors/shifts
50 - 70 years tollerable lost of colors/no visable shifts
over 70 years beginning massive lost of color (saturation) normal shifts.
100 - 120 years bw film (estimated)
- C 41 nearly the same like E6
- Bw min. of 70 - 90 years without visible change
90 - 120 years light damage of emulsion
(physicaly lost of parts of layers due to humity/ tollerance of temperature)
120 - 150 years some bw films still OK
most damaged from bugs and environmental reasons chemical gases/
humity a.s.o.
Is this OK to you ? Perhaps try to get data from a 80th dos discete/cardrige and imagine the year 2065 to find a operating system to your DVD / Blue-Ray medium.
My oldest bw films are from 1926 I personaly had a view on some bw films damaged (just some frames) from 1931.
But I can't say from what reasons.
WW2 ? Water from big storms through the roof in the 50th ??????
My Kodachrome from 1986 looks like yesterdays shots.
with regards