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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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(a–c) Optical microscopy images of artificially aged blue Bic, Staedler, and Pilot inks on paper; (d–f) Comparison between aged and unaged SERS spectra for blue Bic, Staedler, and Pilot inks on paper.