Crafting ultrathin color coatings: Physicists produce vivid optical effects—on paper

In a sub-basement deep below the Laboratory for Integrated Science and Engineering at Harvard University, Mikhail Kats gets dressed. Mesh shoe covers, a face mask, a hair net, a pale gray jumpsuit, knee-high fabric boots, vinyl gloves, safety goggles, and a hood with clasps at the collar—these are not to protect him, Kats explains, but to protect the delicate equipment and materials inside the cleanroom.

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