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. 2021 Nov 24;11:22868. doi: 10.1038/s41598-021-00843-0

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Mean percentage transfer to an artificial finger from various solid material during a 5 s contact with a 3 N (299.2 ± 1.2 g) load with no lateral motion (i.e., no rubbing). Error bars are the comparison intervals from ANOVA with two factors: the material and the time, which corresponds to wet or evaporated. MATLAB was used to create the figure and to calculate the ANOVA. The error bar is asymmetric because of the exponential distribution of measurement residuals. When the upper bound is off-scale, it is indicated by a number. The time to adsorb the droplet on porous surfaces was as follows: tissue and porous glass, immediate; wood, 1–2 min; and paper, 2.5 min. Note that the transfer is high for non-porous solids and is measurable when the 1 µL test drop is wet (10 s) or has evaporated (30 min). Each data point was obtained from three independent measurements that are tabulated in Supplementary Table S1.