Scientific Results

Drawing materials studied by THz spectroscopy

Year: 2017

Authors: Taschin A., Bartolini P., Tasseva J., Striova J., Fontana R., Riminesi C., Torre R.

Autors Affiliation: European Lab. for Non-Linear Spectroscopy (LENS), Univ. di Firenze, via N. Carrara 1, Sesto Fiorentino, Firenze, I-50019, Italy; Dip. di Fisica e Astronomia, Univ. di Firenze, via Sansone 1, Sesto Fiorentino, Firenze, I-50019, Italy; INFN, Istituto Nazionale di Fisica Nucleare, Sez. di Napoli, Complesso Univ. di M. S. Angelo, Ed. 6-Via Cintia, Napoli, 80126, Italy; Istituto Nazionale di Ottica, INO-CNR, Largo Fermi 6, Firenze, I-50125, Italy; Istituto per la Conservazione e la Valorizzazione Dei Beni Culturali, ICVBC-CNR, Via Madonna del Piano 10, S Sesto Fiorentino, I-50019, Italy

Abstract: THz time-domain spectroscopy in transmission mode was applied to study dry and wet drawing inks. In specific, cochineal-, indigo-and iron-gall based inks have been investigated; some prepared following ancient recipes and others by using synthetic materials. The THz investigations have been realized on both pellet samples, made by dried inks blended with polyethylene powder, and layered inks, made by liquid deposition on polyethylene pellicles. We implemented an improved THz spectroscopic technique that enabled the measurement of the material optical parameters and thicknesses of the layered ink samples on absolute scale. This experimental investigation shows that the THz techniques have the potentiality to recognize drawing inks by their spectroscopic features.

Journal/Review:

Volume: 6 (3)      Pages from: 12  to: 17

More Information: This work was funded by Regione Toscana, prog. POR-CROFSE-UNIFI-26 and by Ente Cassa di Risparmio Firenze, prog. 2015-0857. The authors of INO-CNR acknowledge IPERION CH project GA 654028, funded by the EU community’s H2020-research infrastructure program.
KeyWords: Drawing material; Ink; THz spectroscopy