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. 2023 Aug 16;9:39. doi: 10.1038/s41405-023-00161-9

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© The Author(s) 2023

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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Fig. 4 — The mean color changes (∆E*) of the two types of micro and nano composites, indicated by the height of the vertical column, increasing proportionally with immersion times (1, 3, and 7 days) in different media. It is visible that qat (green column) had the highest discoloration on both types of composites.