Digital BW, The Print

pr_roark wrote:

> 
> Did you also notice the very low amount of carbon in the HP ink?  
> They claim their pigments are simply darker.  I know that is one area 
> where advances were on the horizon.  In any case, the small amount of 
> carbon makes me curious about the longevity.  I know the Wilhelm 
> ratings are excellent, but that could be in due to HP's ability to do 
> greater grey substitution in color and none at all in B&W.  I also 
> expect that coating technology will ultimately advance to the point 
> where the coatings are oxygen barriers.  What I'll do is run a test 
> of the a diluted Eboni against an equal density of the HP grey and 
> see how they compare.  

Paul,

The Vivera B&W ratings are excellent, nothing touches it. I 
know the argument that the long black generation and no 
composite greys suit the Wilhelm and Image Engineering tests 
but on the other hand I have not seen evidence in other test 
results yet that the remaining color mixes degrade faster 
than the primary colors. What has been mentioned here and 
linked to were older dye ink results that went wrong in 
composite greys and secondary mixes. Discussed here  not so 
long ago in relation to catalytic fading. Anyway if the ink 
chemistry and the way to lay them down makes it harder to 
fade the B&W prints without sacrificing image quality then 
HP did a good job. If better test methods show that the 
secondary mixes in color printing still show more fading 
than the primaries then there's work to be done, but it may 
still be better than Epson's ratings. Canon could have done 
or already does the same as HP but the tests score lower 
than HP.


-- 
Met vriendelijke groeten, Ernst


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