I'll try to respond to two postings at once here.
You asked about the longevity of color laser toners. Laser toners are
made of a mixture of dyes, pigments, and usually a styrene plastic, all
mixed together and ground very fine. Unlike liquid inks, which can
separate, thicken, gel, evaporate, settle out, etc, toner powders are
relatively stable, if kept in a dry cool setting. The probably biggest
risk is they can clump or compact over time, but probably even that can
be lessened if they are shaken well before placed in use, or are remixed
and shaken every so often to keep things mixed well.
As to the issue of photographic quality laser printing, can you tell me
a bit more about your needs? What type of image, and how many do you
need? How close to photographic does the output need to be (what's the
application)? How often will you be printing, how large a run per image,
how large an image (largest), what type of media will you be printing to
(paper, card stock, art quality paper, glossy, luster, matte, etc)?
There are a LOT of different printing technologies out there. As an
example, the Indigo printing method, which HP bought the rights to, uses
liquid toners, producing a pretty interesting electrostatic print using
specially coated papers. I believe HP redesigned these machines and
redeveloped the toners they use. There are several versions, but they
are major machines for printing industry use.
Check out this website for more info on it:
http://h30267.www3.hp.com/country/us/en/products/digital_presses/index.html
There are also small offset presses, and other models from several
manufacturers. There rae many wide carriage inkjet printers using dye
or pigment inks. Epson Ultrachrome printers produce photographic results
using slow drying pigment inks that don't usually clog. There are many
versions up to about 44" wide.
Art