Trademarks are usually attached by laser film or hot stamping. Here we need to know the internal structure of the laser film. The most important are the aluminum layer and the information layer. The aluminum layer is reflective, while the information layer can provide the required patterns and colors. Different angles get different colors because the refraction of light at different angles is different, just like the splitting effect of a prism, and these different colors of light are still interfering with each other, so you will see the changing colors.