2021 Volume 60 Issue 5 Pages 520-527
From the perspective of biodiversity conservation, in the 21st century, environmentally friendly manufacturing is required to achieve the SDGs (sustainable development goals). Among the colored materials that make our lives colorful and rich, such as dyes and pigments, those that are harmful to human health and the environment need to be changed to safe materials. In nature, we are already using safe, low-fading structural colored materials that exhibit a variety of hues, without the use of toxic compounds and heavy metals. In this article, I would like to introduce bright angle-independent structural colored materials that use only safe and inexpensive white and black materials.