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. 2022 May 15;14(5):1048. doi: 10.3390/v14051048

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© 2022 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Microscopic analysis of coupon material surface textures. Light microscopy at ×20 magnification: (a) unscratched SS304, (b) scratched SS304, (c) aluminum 5251 alloy, (d) ABS smooth surface, (e) ABS pinseal texture, (f) melamine laminate, (g) KYDEX^® haircell texture, and SEM microscopy at ×1000 magnification. (h) SS304 showing surface complexity (×1000 magnification) and (i) melamine laminate showing deposited droplets of artificial saliva–fluorescein matrix and crystal formation (×250 magnification).