In article number 1700828, Dianyun Zhang, Luyi Sun, and co-workers develop a series of moisture-responsive wrinkled-surface devices made using a poly(vinyl alcohol)–poly(dimethylsiloxane) bilayer system. These devices demonstrate reversible, temporary, or permanent wrinkles as moisturized, providing a route to tune the optical properties of a wrinkled surface for various applications, such as encryption devices, anticounterfeiting tabs, and water indicators.
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