The Permanence and Care of Color Photographs by Henry Wilhelm is
(IMHO) the most important photography book of the last ten years.

Wilhelm describes his research into the archival properties of color
prints, Type R prints, color slide film, color neg film, B&W paper (RC
& FB).  Wilhelm also discusses techniques for the preservation and
storage of photographs, i.e. envelopes and sleeves, refrigerators,
etc.

Many of Wilhelm's conclusions are injurious to the reputation of
Eastman Kodak products, especially his conclusion that Fuji paper
(both Type R and C prints) outlasts Kodak by factors of two or three
(also that Fujichrome slides last much longer than Kodachrome when
projected).  Presumably because no publisher would take the book as is
(it alleges that Kodak intentionally obscured the truth about their
products' non-archivalness), he publishes it himself.  You can get a
copy from

Preservation Publishing Company
719 State Street
P.O. Box 567
Grinnel, Iowa 50112
(515) 236-5575, (800) 335-6647 x49

The price is $69.95 plus $4.95 S&H and well worth it given that the
book is thick and filled with color and B&W photos.  They take Visa &
M/C.

----------------------Color Neg data

For a 20% loss of the least stable image dye in accelerated dark
fading tests at 144 deg. F and 45% RH (figures are in DAYS):

Kodak VPS:              215 (implies about 80 years at room temperature)
Kodak Ektar 1000:       200
Kodak Gold 400:         175
Fuji normal neg films:  130
Konica 100:             110
Kodak VR films:         110
Kodak Ektar 25:         90
Fuji Reala:             85
Kodak Gold 100:         85
Kodak Vericolor HC:     85
Agfa various:           75
Kodak VPL:              30

Thus, VPS should last approximately twice as long as Reala (but will
the marriage outlast either?)

----------------------------Color slide data

For a 20% loss of the least stable image dye in accelerated dark
fading tests at 144 deg. F and 45% RH (figures are in DAYS):

K25, K64, K200:         580
Ektachrome, all:        225
Fujichrome, not Velvia: 185
Fujichrome Velvia:      135
Agfachrome 1000:        75
ScotchChrome 1000:      45

--------------------------Color Print Paper (Type C from negs)

"Fujicolor Paper Super FA Type 3 and a higher-contrast version (SFA3
Type C) for commercial labs are by far the best, longest-lasting RA-4
compatible color negative papers available. ... When exposed to light
on display, the Fujicolor SFA3 papers will last more than four times
longer than Ektacolor Edge, Ektacolor Portra, Supra, Ultra, and teh
other Kodak RA-4 papers."

--------------------------Color Print Paper (Type R from slides)

"Ilford Ilfochrome [Cibachrome] are the only products that can be
considered to be absolutely permanent in dark storage at normal room
temperatures. ... Fujichrome Type 35 paper is by far the best choice
among Process R-3 reversal papers.  With its good dye stability and
low stain level in dark storage together with good light fading
stability, this is the slide-printing counterpart to Fujicolor SFA3
papers for printing color negatives.  It should be noted, however,
that although Fuji SFA3 and Type 35 have similar dark storage
stability, SFA3 paper is much more resistant to light fading on
display.  For that matter, the light fading stability of Fujicolor
SFA3 paper is significantly better than that of current Ilfochrome
prints!

...


Kodak Ektachrome Radiance Paper, introduced in 1991, ... falls
considerably short of Fujichrome Type 35 paper in both light fading
and dark storage stability."