However, since man 1 says that he can see the "colours" of the hats, man 2 would be able to see the color of the blind man's hat and therefore know the color of his own since the word color was plural in the first man's statement. Unless, of course, they are unaware of the colors of the hats represented in the black room.
If you are going to use the word "colours" as evidence, then you must consider that it would also affect the knowledge of man 2. Since there are only two different possible colors, the second man should be able to figure out his own hat color. Or are we assuming that o