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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/).
Boxplots representing the quantification of hand dirt: DH1 (light blue)—dirt after application of the first contamination scenario (using borsch) and DH2 (purple)—dirt after application of the second contamination scenario (borsch + oil).