美国Engelhark研制开发出幻彩薄膜。该薄膜不含颜料或染料，完全依靠光学的原理产生出彩虹般幻彩效果。这种柔软的透明薄膜，厚度很小，然而所包含的两种或更多种不同的聚合物却有１００至２００多层。通过这种结构，光线从外面进入薄膜，在不同层面产生多次的反射和干涉，从而 United States Engelhark developed Symphony film. The film contains no pigments or dyes and relies entirely on the optical principle to create a rainbow-like effect. This soft, transparent film, with a small thickness, contains between 100 and 200 layers of two or more different polymers. With this structure, light enters the film from the outside, creating multiple reflections and interferences at different levels, thereby