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Re:Ask HN: Who has downvote privileges and what is the crite... by ColinWright on Sunday July 31, 2011 @01:29PM (#2828904)
A comment turns grey when its points value goes to 0, and goes more grey as it goes more negative.

    "no comment receives downvotes for more than 24 hours."
This means that the downvote arrow is only visible/enables on a comment for 24 hours. Once a comment is more than 24 hours old you can no longer downvote it.
Re:Ask HN: Who has downvote privileges and what is the crite... by dfc on Monday August 01, 2011 @02:00AM (#2830954)
So I recently had a comment downvoted in this thread about bitcoin's legal/regulatory environment:

http://news.ycombinator.com/item?id=2817899

I posted a link to a law review article and the link was downvoted. It does not make a lot of sense why...