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I thought that once the kiss of death on your pages (the supplemental tag) had been through - that was it for the domain unless sold, reviewed manually by google or a you were lucky enough to get lucky.
So having seen a rise in traffic for one of my domains I checked it out to find that a massive amount of new pages had been listed (10,000 odd) - none of which had been tagged with the 'supplemental' status.
Is this is a fluke or this is a quick win before a complete wipe?
This whole site had about 5000 listed urls a few weeks ago, that went down to as little as 900 around christmas and now the site:www.mydomain.com command shows just over 4000 pages again.
Just before christmas I introduced new sub directories and re-direct all queries from the old flat design to these new urls. This of course resulting in a massive amount of new supplemental results.
However, the new urls are doing fine, and have regained their old position in SERPs.
So don't be scared of the Supplemental results tag. It doesn't seem to hurt the rest of your site at all in my oppinion.