The paint loss of Callmander’s stained glass windows: An investigation of the prevalence and causes behind the paint loss on Callmander and Svenska Glasmåleri AB’s stained glass windows

Abstract: This MA-thesis investigates the loss of grisaille paint in the stained-glass windows created by the artist Reinhold Callmander and Svenska Glasmåleri AB, with the aim of understanding the prevalence as well as the reasons behind the issue. Stained glass has historically been in the periphery of conservation. This thesis seeks to generate valuable information for both future conservation decision-making and cultural history context. Understanding the reasons for the paint loss can serve as a first step in reducing the risk of further deterioration by raising awareness, highlighting urgency of action and providing information necessary to implement preventive measures. The methods used in this thesis consists of a literature review, condition assessments of Callmander’s stained glass in Gothenburg and Varberg, and technical analysis with microscopy, X-ray fluorescence and scanning electron microscopy of glass shards from two of Callmander’s windows. Through the condition assessments, the study indicates that paint loss is a common issue amongst Callmander’s stained glass windows. Furthermore, the study shows that manufacturing issues are likely responsible for paint loss, possibly due to insufficient firing. To fully establish the cause of paint loss, more research is needed.