Re: Interview with Henry Wilhelm on print permanence

Kennedy McEwen wrote:
> In article <1178435144.752989@[EMAIL PROTECTED]
>, frederick <lost@[EMAIL PROTECTED]
> writes
>> Kennedy McEwen wrote:
>>> In article <1178322277.137906@[EMAIL PROTECTED]
>, frederick <lost@[EMAIL PROTECTED]
>
writes
>>>> Sure - I agree that because an ink/paper combination gets a 200 year 
>>>> DPR from Wilhelm doesn't mean it will last 200 years on my dining 
>>>> room  wall.  But you can be highly confident that it will last much 
>>>> longer  than an ink/paper combination rated at 10 years.
>>>  Then you have missed the whole point of the article I posted because 
>>> Wilhelm tested Epson media and others available at the time.  Whilst 
>>> most media had display lives of the order of a few months, Wilhelm 
>>> *****sed the Epson ink and gloss media to have 26 YEARS of life - 
>>> much better than anything available.  Nobody expected to achieve 26 
>>> years unless the exact test conditions were used.  Many people made 
>>> exactly the same mistake as you have suggested and expected 26 years 
>>> to indicate  that "it would last much longer than an ink/paper 
>>> combination rated at"  months.  They were WRONG, and so are you!
>>>  The fact is that Epson got into problems with the claims they made 
>>> based  on Wilhelm's testing because the test was meaningless and 
>>> their prints  only lasted days and, in some cases, hours!
>>
>> I don't believe that I've missed the whole point at all.  I don't 
>> dispute that gas fading caused a big headache, but gas fading is "old 
>> news".
> 
> Whether it is old or new news doesn't make it irrelevant.  The fact is 
> that you cannot draw any conclusions from the Wilhelm testing that are 
> relevant to the real world or any conditions other than those he tests 
> under.  Not knowing what the next unexpected cause of premature print 
> aging only makes that more obvious.
Then exactly the same criticism must apply to any process.  Perhaps the 
only close to 100% safe method for colour is to archive digital files - 
but then another can of worms is opened.  YMMV and we can only go on the 
best information that is available.