I recently added an older blog to my Google Reader (it doesn't have any posts within the last year). Because of this all posts show as "read". So, if I browse by viewing "all items", all the posts show. But because they are all "read", I can't hide posts from the view by marking them as "read".
Ideally I would like to be able to mark these old items as "unread" and have a shortcut to mark all of the items in this old feed as "unread".
I see that I can tag individual posts in the feed as "unread". And then I can browse the "unread" tag, and remove individual posts from the tag as I like. The big flaw with this, is that I have to manually mark each post as "unread".
How can I hide posts when everything in a feed is marked as "read"?