When I cruised last, I took the tour on the ship and they talked all about this. They talked about how the colors of the ship came to be. They wanted to use the three Mickey Colors. Black, Yellow and Red. But they had a few problems with that. All lifeboats have to be orange, so Disney had to fill out lots of forms and fight to prove that yellow was just as noticeable as orange in the water
.they won and now even other cruise lines have yellow lifeboats. It cost Disney a bit of money to get this law changed, but to them it was worth it. As far as the black, no way would they let a black ship sail on the open waters. Then one day a Disney cast member walked into a meeting and had on a very dark blue dress. They right away asked the woman for the dress and they took it to the painters and had that color made. Its NOT black; its a blue, so it was approved. The color of the ship is Monica Blue, named after the woman who was wearing the dress that day.
So the person who said it's BLUE, is correct!