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Chiang’s team used a liquid reagent made of water and ammonium fluoride — the active chemical in glass etchant — to do the exact opposite.—Mrigakshi Dixit, Interesting Engineering, 28 May 2026 The analogy that the research team gave is that using chemical etchants to sculpt atomic-sized graphene would be like making patterns in a thin piece of paper with a hacksaw.—Dexter Johnson, IEEE Spectrum, 28 Apr. 2015