Gustavo Adrián Defeo FSLTC is an Italo Argentinean chemist with 37 years’ experience in Leather and fashion materials. After many years involved in leather chemicals production and technical support, he founded in 2011 Ars Tinctoria, an analytical and research laboratory in Santa Croce sull’Arno. He is currently Chairman of ISO IULTCS IUF and Convenor of the CEN TC 289 WG3 commissions. Docent of many institutions such as the Master “Sustainable Leather Management” ITIS Galilei, Arzignano, “Out of fashion” of the Gianfranco Ferrè foundation among others. Since 2020 works in research projects related to Radiocarbon measurement on materials and chemicals.