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. 2020 Apr 14;10:6329. doi: 10.1038/s41598-020-62938-4

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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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Optical image for red pigments. (a) Optical image obtained with a 4x objective of an area of interest of the talon 386.1. (b) Zoom of the measured area with a 15x Cassegrain objective. (c) spectra of the white spot in panel b (red circle - black dot line) and average spectrum of the three red spots in panel b (red circles - red dashed line), the blue line is the spectral difference between red and white areas. Arrows point at the three main bands of ochre. Scalebars 100 microns.