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. 2019 Oct 25;7:727. doi: 10.3389/fchem.2019.00727

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Copyright © 2019 Saviello, Trabace, Alyami, Mirabile, Baglioni, Giorgi and Iacopino.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Optical microscope images of artistic drawings realized with (a,b) blue pens on paper. Insets: photographs of the entire drawings under the Raman spectrograph objective; (c) Raman spectra of the artistic drawings shown in (a,b).