Observation and analysis of Zwischgold on late medieval sculptures

Zwischgold is a gold-silver bi-layer foil that was popular in medieval European sculptures yet is poorly documented in both historical and modern literature. It is notoriously difficult to identify unambiguously and to study in detail due to its ultra-thinness and tendency to corrode. This article focuses on understanding the corrosion states and technological features of medieval Zwischgold. High-resolution scanning electron...