-----Original Message-----
From: Paul Roark [mailto:paul.roark@...]
Sent: Saturday, September 11, 2004 3:23 PM
To: DigitalB&WPrint
Subject: [Digital BW] Yellowing of paper by antioxidants
There have been occasional reports of PhotoRag being yellowed by tape on
the
outside of packages and by the rubber clips that stop large format printer
paper rolls from unrolling when not in use.
I ran across this article, apparently by Mitsubishi Paper Mill that
indicates antioxidants might be responsible for this yellowing. The
following are snips from this article.
(See http://web.infoweb.ne.jp/mpm/inkjet/english/storage.html)
"Materials of clear files contain plenty of antioxidants to prevent
discoloration and deterioration by oxidization. Antioxidants contained in
the film are diffused as vapor, although they are small in quantity. When
inkjet papers are kept in a clear file, antioxidants diffused from the
clear
file reach the surface of the inkjet papers. As the ink receptor layer of
an
inkjet paper consists of fine particles, it has a large porous surface
area
that easily absorbs chemical compounds. The antioxidants absorbed change
the
color of the paper to yellow through air oxidation."
.
"Tape consists of a thin plastic film and glue, which generally contain
antioxidants. Yellowing due to tape is caused by the same mechanism as
yellowing due to storage in a file."
"Rubber bands and rubber rolls contain antioxidants to prevent them from
hardening during storage. Yellowing is caused by the same mechanism as
yellowing due to storage in a file."
Paul
www.PaulRoark.com <http://www.paulroark.com/>
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