What do cosmetics, car finishes, passports, bank notes, tropical insects, and oysters have in common? The color is formed through a specific microscopic organization of the matter making up the material, often called “iridescent” or “holographic,” both referring to the flashy, rainbow-like colored appearance. Chemical engineer Jeroen Sol explored how liquid crystals could be used as a versatile ink material to generate such lustrous colored coatings.
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Source: Phys.org