Researchers have developed a material that almost instantaneously changes from clear to dark blue when exposed to ultraviolet light, and quickly reverts to clear when the light is turned off.

• 日前，研究人员开发出一种新材料，当其暴露在紫外线下时，几乎可在瞬间从透明变为深蓝色，而一旦避开紫外线，又能够迅速变回透明。