Kaecha Oh!! Magical Ramen Shop I have confirmed that the colors change properly. They change with hot water and ice water. A part of the bowl has lost some color, but I don't think there will be any problem with its use. Please check the 4th photo. Otherwise, I think there are no noticeable scratches or stains. This was not used in the bath, but was used and stored indoors. Please check the photos and purchase only if you agree. Since this was used by a child, please refrain from purchasing if you are concerned. If you have any questions, please feel free to comment. Thank you very much.