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"Pereira de Lisboa" wrote in message
oups.com...
Hi,
a few books in my personal library have some strange reddish stains
along the upper border. I've just posted on Flickr some photos about
this issue: see http://www.flickr.com/photos/7780863@N06/ The books
are 5-6 years old. What could be the cause? Mould, moisture, bad
quality paper? Must I isolate the stained books? Are they contagious
for other books?
Thanks
Pereira