Hi All,

There is a site with chemical forums at chemistry.com. Domain is old,
as far as I know several months ago old content was removed and forums
were started. They are not indexed. No robots.txt, no NOINDEX/NOFOLLOW,
old content slowly phasing out from google index, so it was indexed
before (try "and site:chemistry.com"). 42/48 links reported depending
on datacenter. PR 0 although I think it have seen it higher after January.

URLs contain long hexadecimal digit as one of the parameters, as in
t=thread&frm_id=3&rid=765&S=98b55f6b11c2a2c3b67ae0 dbd37de620.

Could it be the problem?

I have no access to logs (I am only a user, not admin) so
I can't check what is going on.

Best,
Borek
--
http://www.chembuddy.com - chemical calculators for labs and education
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program for pH calculations
CASC - Concentration and Solution Calculator
program for solution preparation and concentration conversions