: porous unsized paper used especially for filtering
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Inspired by wetland plants like mangroves, 12-year-old Ella Barth and Esme Tsai’s prototype glass funnel uses layers of coffee filter paper, gravel, sand, ion exchange resin, charcoal and cotton, mimicking a natural filtration process to help rid local tap water of its chalky taste.—Karen Billing, San Diego Union-Tribune, 2 June 2026 Whereas regular blood tests are drawn directly from athletes, DBS testing is a process in which drops of blood from small skin pricks are dried on filter paper and shipped to labs for remote analysis.—Matt Moret, New York Times, 3 Apr. 2026 Area monitors suck particulate emitted by power plants onto filter paper, which can be analyzed to see whether or not there has been an uncontrolled release of radiation.—Chris Baraniuk, Wired News, 15 Dec. 2025 The aircraft is equipped with external flow-through devices to collect particulates on filter paper and a compressor system for whole air samples collected in holding spheres.—Ryan Chan, MSNBC Newsweek, 5 Dec. 2025 See All Example Sentences for filter paper