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. 2022 Jul 20;13:4185. doi: 10.1038/s41467-022-31978-x

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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. 6 — a Schematic representations for the printing experiment and a photograph of the printing pattern 2D code decrypted under UV light. b Fluorescence images of the printing pattern before and after treatment with organic solvent (blue) and water (orange). The fluorescence change was reversible and transient, reverting back to yellow with time. c Fluorescent photographs of the printing binary code, illustrating colour and time dual encryption functions.