Digital BW, The Print

My latest fade test (compact fluorescent light) reached 600 hours.  So, I
have some initial fade results.

The short version:  UT7 showed less fading than the 4800 "Advanced B&W" mode
prints both in the highlights and at 50%; the MIS new base does not appear
to negatively affect UT performance; and inks on Kirkland paper are very
stable.


Notes: The results are expressed in Lab and were read with the X-Rite DTP 22
spectrophotometer.  The same paper batches were used for all comparisons.
The results shown are the average of 3 readings.  The affects of the
variability of the spectrophotometer were minimized by reading comparison
test strips at the same time.  The actual starting, pre-fade densities may
vary from the control test strips, but comparisons based on the pre-fade
measurements resulted in similar comparisons.  The UT7 comparison test
strips were printed with "neutral" curves that were modified to match the
density and tone of the 4800 test strips as closely as reasonably possible.


Spectrophotometer readings:

EEM 0% (paper white) Control: (96.83, 1.03, -3.49)

                     Change: (-0.04, -1.4, 4.48)

      Comment: As we know, the paper yellows.  
               This will affect mostly the highlight results.

4800 EEM AB&W Neutral 5% Control: (92.76, 1.20, -3.79)

                         Change: (0.16, -1.49, 4.92)

7600 UT7 Neutral 5% Control: (92.79, 0.83, -3.98)

                    Change: (-0.02, -1.59, 4.94)



4800 EEM AB&W Neutral 10% Control: (88.35, 1.07, -3.11)

                          Change: (0.52, -1.39, 4.73)

7600 UT7 Neutral 10% Control: (89.18, 0.34, -3.34)

                     Change: (-0.04, -1.41, 4.53)


4800 EEM AB&W Neutral 50% Control: (53.55, 0.72, 0.38)

                          Change: (0.67, -0.55, 2.04)

7600 UT7 Neutral 50% Control: (54.04, 1.96, -0.27)

                     Change: (0.08, -0.68, 1.93)

2200 UT7 New Base 50% Control: (53.53, 1.17, 0.14)

                      Change: (-0.14, -0.68, 2.04)

Kirkland UT7 50% Control: (56.54, -0.52, -4.17)

                 Change: (-0.33, -0.56, 1.24)



Paul
www.PaulRoark.com