Dear colleagues, friends and students,

We invite you to attend the seminar by Dedo von Kerssenbrock-Krosigk (Head of Glasmuseum Hentrich) "Matter of Ambivalence: Aspects of glass in Ancient Cultures and the Middle Ages" & Jerzy Kunicki-Goldfinger (Institute of Nuclear Chemistry and Technology, Warsaw, Poland) "In search of quality: The evolution of glass technology in Central Europe and its impact on the durability of post-medieval glass".