Digital BW, The Print

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Paul Roark" 
<paul.roark@v...> wrote:
> I want to correct and expand on my original posting on this InkJetMall test.
> 
> The question was:
> 
> >> Is there any comparisons available that shows the longevity of 
> >>Ultrachrome inks vs. Carbon Inks such as f.ex. MIS Quadtones?
> 
> >Inkjet mall's website has a comparative analysis of Ultrachrome, 
> >various Piezotone (carbon) inks , Sundance and MIS-FS inks based on 
> >1000 hr xenon lamp tests.  ... Here's the link:
> 
> >http://www.inkjetmall.com/store/info/1000-hours.html
> 
> I originally misread the test of Photo Black to be Light Black -- my
> mistake.
> 
> However, my opinion of the credibility of the InkJetMall (IJM) test stands
> -- I do not believe the results can be taken at face value.  
> 
...
> 
> Maybe I'm just misreading the IJM test results, but too many of the numbers
> just don't make sense to me.  When that is combined with a test design that
> seems to be stacked against Epson, I must say that the test tells me more
> about IJM that about the relative merits of the inks.
> 
> Paul
> www.PaulRoark.com

I have to agree that the IJM test results for Ultrachrome don't make much
sense.  It's especially wierd if you look at the LAB values given.

First off, Photo Black and Cyan have identical LAB values to 3 significant digits,
both before and after the test period.   Next, both of the blacks have extreme 
blue components (the b of Lab).  And to top it off, every single one of the 
L values went DOWN after the test -- this means the density increased!

It looks to me like whoever measured values jumbled the data.  I wonder
if Cone could be convinced to re-measure and analyze the data (if possible).

Roy