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Recent Examples of roughenTo address both weaknesses, engineers coated the nitride film—a combination of GaN and InGaN layers—with a metal that acts as a mirror, then flipped the assembly over, removed the substrate, and roughened the underlying surface.—IEEE Spectrum, 30 Dec. 2010 Celebrity nail artist Queenie Nguyen says that a nail technician will first use a coarse nail file to remove the shiny top layer and roughen up the surface.—Audrey Noble, Vogue, 27 Nov. 2023 Test sample: Low-carbon steel joined to form a T. Surface and end roughened by grinding with 60-grit abrasive.—Roy Berendsohn, Popular Mechanics, 4 Aug. 2023 To try to remedy the situation, workers dragged tires and scrubbed the slick surface to try to roughen it up a bit.—Nathan Brown, The Indianapolis Star, 22 Apr. 2022 The optional mirror-bright 20-inch wheels look great but roughen the ride.—Dan Neil, WSJ, 3 Feb. 2022 That can roughen up the cuticle, which leads to tangles, frizz, and then breakage.—Sable Yong, Allure, 29 Dec. 2021 Fisher has recruited sturdily in his four seasons at A&M, but that road will roughen in the state with UT and OU joining the mighty football conference, one that has led the nation in NFL draft picks for 15 consecutive years.—Brent Zwerneman, San Antonio Express-News, 28 Sep. 2021 This will roughen up the paneling’s glossy surface, so the primer will adhere better.—Joseph Truini, Popular Mechanics, 18 Dec. 2020
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