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The answer to the crossword question “Use a laser, perhaps” is ETCH. Etching is a process where a design or pattern is engraved onto a surface using a tool such as a laser. Lasers are often used in etching because they are very precise and can make very fine lines. The laser heats the surface and causes it to vaporize, leaving behind a permanent mark. Etching is used in a variety of industries, including manufacturing, electronics, and art. It is a versatile process that can be used on a wide range of materials, including metal, glass, and plastic.