Jon Cone asked that the 100 hour Xenon Arc tests of the full ink tests be
placed in comparison to the Paul Roarke tests. Jon Cone felt that the
example of a black ink only test is misleading because neither product is
designed to be printed with black ink only.

A 50% patch of black is not printed with either the PiezographyBW
Workflow, or the RGB Curves workflow, or RGB EPSON output. Black ink is only
printed in the very high 80% range and in minute quantity with Piezography
and is not present until the 90% range in strength. This is similar but not
exactly how the EPSON driver prints black in terms of densities present. And
of course there are other inks under this black ink that are essential to an
evaluation of meaningful data.

PiezoTone inks do not use dyes in the non-black position inks (cyan, photo
cyan, magenta photo magenta, yellow) and which is why there is no warm
fading with prints made with PiezoTone inks. MIS-FS inks use a different
formula which may or may not contain dye in them, but do warm considerably
in comparison to the PiezoTone inks.

PiezoTone black uses a trace amount of dye because carbon itself is not
black enough to get a high dMax. It is the only position which has dye
content. Its warming will not be noticeable in conventional use such as
PiezographyBW software, RGB Curves workflows, or RGB EPSON driver output.

These test images clearly shows that a typical full range image printed with
PiezoTone inks does not warm fade as the MIS-FS inks do. The black ink only
test implies the opposite. For these tests, the center of a print was cut
out and exposed to 100 hours in a Xenon Arc chamber, then taped back into
the print from the rear, which accounts for the rectangular shapes within
each image.