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. 2020 Jan 7;11:77. doi: 10.1038/s41467-019-13844-5

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© The Author(s) 2020

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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 5 — a Preparation of code blocks A_m, M_α, M_β, and C_δ. b Transformation and masking mad possible by using (i) an original printed colour pattern, (ii) room and/or UV light, and (iii) the time-dependent organic vapour-induced changes in the luminescent features of the constituent code blocks, A_m, M_α, M_β, and C_δ. Additional photographs of the various patterns are included in the Supporting Information.