Digital BW, The Print

john schreef:

> It's interesting that Wilhelm's long published results for Chrystal 
> Archive shows it at 450 lux to have an end point at 40 years or 50 
> years behind uv glass. That is a long way from 17.4 years that your 
> site reflects. He's allowing for a greater rate of fade (35% ?) 
> before reaching the end point which your saying is way too far and 
> too noticeable? That is the way I'm reading it.  And I don't think he
>  is factoring in the burnout of the optical brighteners. At any rate 
> he's being generous it seems to me.

> 
> john


In 2001? Wilhelm gave Fuji Crystal 60 years, later on 2004?  that
dropped to 40 years.
You will see shops give either the old or new numbers depending on their
interests.

Image Engineering has it at 17 years,
More than 100 at the ozone test (like more RC based prints),
http://www.image-engineering.de/index.php?option=com_content&view=article&id=57&Itemid=91

For Aardenburg I think the patch number will have an influence. Intended
to give a true rating for printers that replace color mixes with sigle
hue and monochrome dots it may as well be more severe on coupled dyes in
continuous layers = chromogenic prints. Check on what colors fail in
the tests, If they fall outside the Wilhelm patches you have an answer.
Didn't check that so I could be wrong.

-- 
Met vriendelijke groeten,   Ernst


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