Digital BW, The Print

Yeah...and I didn't give him a bogus inks sample!!!  I'm exonerated!!!

Robert

On 3/24/02 10:43 AM, "Bill Morse" <willym@...> wrote:

> Paul, I get this warm, fuzzy feeling whenever you write posts with lots of
> numbers down at the bottom!  LOL
> 
> Seriously, after all the mud that some have slung at you on this and
> (especially) certain other lists, most especially by the makers and
> distributors of certain inkjet products, it must be gratifying to have your
> original findings reconfirmed.  It's just too bad that you had to go to this
> additional trouble, instead of testing something new.
> 
> I just wanted to say that I really appreciate your work and approach to
> these questions.
> 
> Thanks
> 
> Bill Morse
> PhotoProspect
> Cambridge, MA 02139
> 
> on 3/23/02 10:50 PM, Paul Roark wrote:
> 
> I re-ran this fade test to be sure the first one was representative.  In the
> first test, the sample came from a 3rd party.  The new sample came from M&M,
> an apparent distributor of Indelible inks.  As before, the tests were on
> Epson Archival Matte.
> 
> I see no evidence that the first test was not representative of Indelible
> black ink.  The results of the second test at 100 hours are consistent with
> the results of the first test.
> 
> The bottom line results of the current 100 hour fade test are that Indelible
> K fades and warms more than MIS VM K.  The Indelible K has characteristics
> closer to Generations Enhanced black than to MIS VM or FS black ink.
> 
> A scan of the test strips is in the files section of the forum.  The Files
> section is at:
> http://groups.yahoo.com/group/DigitalBlackandWhiteThePrint/files/
> 
> Then go to > "Inksets, reviews and techniques" and see image
> "Fade-Test-100Hr-Indelible(M&M)-K.jpg.
> 
> The specific X-Rite densitometer readings for 100% black depth and fade
> (100% visual density before and after 100 hours of exposure to the bright
> florescent light) and midtone warming (change in 70% cyan-yellow difference)
> for the current test are as follows:
> 
> 100 % Black:
> 
> Indelible 100% control visual density  = 1.76;
> Indelible 100% 100 Hr. fade v. density = 1.74;
>    Fade =  0.02;
> 
> MIS VM K  100% control visual density  = 1.69;
> MIS VM K  100% 100 Hr. fade v. density = 1.68;
>    Fade 0.01;
> 
> Gen Enhanced K 100% control v. density = 1.81;
> Gen Enh. K 100% 100 Hr fade v. density = 1.79;
>    Fade 0.02.
> 
> 70% (X-Rite readings for Cyan, Magenta, Yellow, & Visual):
> 
> (Included below is a calculation of what I think is the best measure of
> "warming" of the print -- which I think is a serious issue with quads.
> Warming involves a tone change caused by the relative increase in red
> [reduction in cyan] and reduction of blue [increase in yellow].  To
> calculate this relative warming, I compare the cyan and yellow readings of
> the contol and faded test strips.  Warming tends to happend quickest at
> first, stablilizing after about 300 hours.  Relative performance at 100
> hours generally is an accurate predictor of relative performance at 300
> hours and on as long as I've done these tests.)
> 
> Indelible K @ 70% Control:  0.70, 0.68, 0.68, 0.69;
> Indelible K @ 70% 100 Hr:   0.66, 0.66, 0.68, 0.66;
>    Warming = change is cyan-yellow readings
>                = (.7-.68)-(.66-.68)
>                = 0.04
>    Fade = (visual density change) = 0.03.
> 
> MIS VM K @ 70% Control:  0.57, 0.57, 0.58, 0.57;
> MIS VM K @ 70% 100 Hr:   0.56, 0.57, 0.58, 0.57;
>    Warming = (.57-.58)-(.56-.58)
>                = 0.01
>    Fade = 0 (no measurable change in visual density)
> 
> Gen Enhanced K @ 70% Control:  0.73, 0.70, 0.71, 0.72;
> Gen Enhanced K @ 70% 100 Hr:   0.68, 0.68, 0.71, 0.68;
>    Warming = (.73-.71)-(.68-.71)
>                = 0.05
>    Fade = 0.04.
> 
> Paul
> http://www.PaulRoark.com
> 
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----------------------
Robert Morrison
rmorrison@...

310-397-2704

4131 Bledsoe Ave.
Los Angeles, CA 90066