Digital BW, The Print

I agree with Paul Roark that it seems likely Epson created the MSDS sheets
to be technically correct, but also hide the true composition of the ink.

Another source of information may be the US patent office,
http://www.uspto.gov/.  A quick search of both 'patent applications' and
'issued patents' using 'epson' and 'ink' in all fields turns up some
interesting hits.

This may be the other extreme of the MSDS sheets.  They have to be so
specific for legal reasons that it makes it nearly incomprehensible except
by patent attorneys.  Nonetheless, there is probably something that can be
learned from reading them.  They certainly go into more detail about
chemicals and other compounds contained in the ink.

Matching the patents to specific inks may also prove a challenge.  A quick
look at my 2200 cartridges and packaging reveals no patent numbers.  Maybe
they haven't been issued yet?  Perhaps there are specific patent numbers on
the Archival Black?  Or maybe there is nothing unique about the inks to
patent.

I'm no lawyer, but if you're involved in creating 3rd party inks, I'd
recommend you seek legal advice before reading Epson's patents.  I wouldn't
want you to get caught up in an infringement lawsuit.  That would be a huge
disservice to us all.

--Tom