Puzzle of the day answer

The blind guy knows he's wearing white because if guy number 1 says is" I don't know" it means that Guy number 2 and himself can't both be black. Then guy number 2 knows that based on what guy number 1 said, it means that they both can't be black so if the blind guy is black , guy number 2 knows that he is white, but he says "I don't know" because the blind guy is white. Which gives the blind guy enough information to know that he is white.