Redirected a bunch of domains to one domain years ago, for SE's and SE visitors only. Bots and human visitors from the SE's got the same content.

However, anyone coming to the re-directed domains from _other_ sources, like type-ins, articles or directory listings, got to the original domains and their content. They weren't redirected.

This was so the main site could get the backlink power but listing sites wouldn't delist the old domains because of the redirects.

I notice now that the PageRank of the redirected domains is a grey bar. QUESTION: If I stop the redirects, will the PR of the old domains be restored, say, in three months?