Digital BW, The Print

On 06/02/2011 06:40 PM, Paul wrote:
>
> Looking at the Wilhelm test of Claria in the 260 and Vivera dye in
> the 8450, the Vivera, under glass, typically is rated 108 years HP's
> better glossy papers v. Claria 98 years.  The Vivera color benefits
> from UV protection, whereas the Claria does not due to differential
> fade issues (one color benefited too much relative to another color).
> This suggests to me that light differences could result is
> significant test differences.  HP, as with their pigments, appears to
> have done a very good job of matching fade rates of the various
> colors to avoid color shifts.
>
>
> The HP did poorly with no glass (there are no equivalent Claria
> numbers).  This is consistent with Mark's feelings that the main
> benefit from the sprays may be the coating, regardless of whether it
> absorbs UV.
>
> Paul www.PaulRoark.com

Right.

There is something I did not mention: the Vivera dye as tested by 
Wilhelm shows that its water resistance is not good. There are HP 
documents that mention HP water tests for the dye and they state it is 
good. I could not get a clear picture whether HP improved the Vivera dye 
on that aspect after Wilhelm's testing.

The Vivera dye is used in several models but HP is a bit vague sometimes 
on which models.


-- 
Met vriendelijke groeten,   Ernst

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