Digital BW, The Print

Hello Richard,

Frank's question re Wilhelm tests and your yellow testing got me more
curious and I've been searching around for more old prints to compare,
and also just reread some of his comments from his 2400 report.

In comment #6 he says, "If prints are...exposed to the open
atmosphere, low-level air pollutants may cause significant yellowing
within a relatively short period of time".  In another section he
mentions cooking fumes and low-level ozone as common household
pollutants that can affect prints.  

Most things I've stuck up around the house are EEM test prints, but I
found an old (possibly 5 yrs) small PR BO print in my kitchen area
that is more yellowed than any other I've ever seen around other parts
of the house.  It's so yellow I thought it was an EEM print at first,
but it's marked down in the corner.

I'm assuming it's caused by being in the kitchen area, and am
wondering about the testing idea I mentioned and how valid any yellow
testing setup could be without a controlled atmosphere.  How could
OBA-related light-exposure-only results be obtained?  I suppose
relative comparisons would be valid as long as all tests were done in
the same area away from obvious sources of fumes.  What do you think?

I'm taking down some of the old prints in the kitchen (tired of
looking at them anyway) and replacing with newer ones, most are on
VFA.  I'll be comparing them with ones on the living room window sill.

Regards,
Clayton


Info on black and white digital printing at    
http://www.cjcom.net/digiprnarts.htm