Although I agree that fading is dependent upon many factors (paper type,
ink type, exposure to UV, exposure to certain gases (Ozone, etc), there
still are a few basic "truisms".
Overall, pigmented inks or pigments have better fade resistance than
dyes. There are physical reasons for this. Dyes are molecular in size,
and they get activated by photons, UV, and oxidizers which can literally
lift the molecules off the paper. The lower the dye load of the ink
(such as light cyan, light magenta, etc, the less protection the lower
molecules get from the ones above, because they are more dilute and
spread out. In general, swellable polymer technology in papers holds
dyes in place better than micropore paper surfaces.
So, for best fade resistance:
1) use a pigmented ink, if possible. Pigmented inks are made up of
literally "chunks" of solid color suspended in a media. The size alone
protects the color better, as does the opacity. Pigmented inks will
tend to cog inkjet heads more easily.
Color laser printers (and color photocopiers) also use pigments mixed
with clear plastics which they become imbedded in during the fusing
process. Most color laser prints are very fade resistance, much more so
than the ink used in offset printing.
2) When using dye inks, using full dye load colors (CMYK, for instance)
will usually hold up better than the light dye load colors (cm).
3) Using a swellable polymer paper will hold dyes in place better than
general fibre or micropore surfaces. Swellable polymer papers usually
get sticky when wet, take longer to dry, and tend to be damaged by water
more easily than micropore papers, which come out of the printer "dry".
4) Matte papers usually hold dyes better than glossy when comparing
similar paper types (see #3)
5) Protection from UV, direct sunlight and gasses will usually protect
any ink better
6) Allow inkjet prints, especially those with sealed of plastic or resin
coated paper substrates to air out for several days or longer before
framing to avoid continuing release of the glycols which take a while to
evaporate. These will leave a ghost-image which can become deposited on
the inside surface of the glass should you frame the print too soon.
Some people suggest placing the prints between clean newsprint to help
to pick up the glycols. Change the newsprint paper every day. You can
probably reuse the newsprint paper once it has fully evaporated off the
glycols.
Art