Re: Levels & Curves (Wilhelm)

[Arthur Entlich <artistic@xxxxxxxxx>]

rafeb@adelphia.net wrote:

> On 29 Dec 2001 at 22:30, Arthur Entlich wrote:
> 
> 
>>My questions are, in areas which do not have abnormal ozone levels, does
>>the original 870/1270 inkset and paper mix degrade faster than Wilhem
>>suggests (I realize no one knows since it hasn't been 25 years) but do
>>all Epson 870 prints fade to orange rapidly, or only ones subjected to
>>ozone pollution?  Just how common is the problem (what percentage of the
>>world deals with excessive ozone levels in the atmosphere?)
>>
> 
> 
> This was discussed ad nauseum, about a year ago, on the 
> Epson list.  I suggest you check the archives of that list.
> 
> To ask "what percentage of the world deals with excessive 
> ozone levels" is a bit like asking, "what percentage of processed 
> film has excessive curvature"  -- if you catch my drift.
> 
> For Epson engineers (or Henry Wilhelm) to have ignored 
> a common atmospheric oxidant is an error of omission of 
> no less magnitude than Nikon engineers ignoring the fact 
> that processed film often has a third dimension.
> 
> 
> rafe b.
> 
> 


I get your drift and it is absolute hogwash!  Nearly every film, mounted 
or left in strips suffers from curvature, and certainly Nikon would have 
had many samples of it and been well aware of this, not to mention its 
been on ongoing problem through numerous models.

On the other hand, Wilhelm's lab is wherever it is, and it either has a 
high ozone level or not.  High ozone levels are hardly standard or 
normal.  It's a damn pollutant, and a hazardous one at that.  I don't 
know what level of atmospheric ozone is required (or number and use of 
photocopiers, laser printers, or sterilization lights) to trigger the 
orange fading, but it appears to be relatively high before this 
phenomenon occurs.

Art


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