Impact of biogenic exudates on the dissolution and browning of stained glass windows

International audienc

Impact of biogenic exudates on the dissolution and browning of stained glass windows

International audienc

Impact of biogenic exudates on the dissolution and browning of stained glass windows

International audienc

Atmospheric alteration of stained glass: influence of Mn-oxidising bacteria (Pseudomona putidaPseudomona\ putida)

International audienceFor several centuries, the external and internal surfaces of mediaeval stained glass windows are continuously exposed to water (rain events, humidity, condensation/dry cycle), which causes the alteration of their external/internal surfaces. These conditions of high humidity also favours the development of microorganisms. Due to their composition, medieval glasses can be attractive substrates for the development of biofilms, as they represent a source of nutrients for microorganisms . However, due to the multitude of parameters involved, these interactions are not well understood and are still poorly documented

Atmospheric alteration of stained glass: influence of Mn-oxidising bacteria (Pseudomona putidaPseudomona\ putida)

International audienceFor several centuries, the external and internal surfaces of mediaeval stained glass windows are continuously exposed to water (rain events, humidity, condensation/dry cycle), which causes the alteration of their external/internal surfaces. These conditions of high humidity also favours the development of microorganisms. Due to their composition, medieval glasses can be attractive substrates for the development of biofilms, as they represent a source of nutrients for microorganisms . However, due to the multitude of parameters involved, these interactions are not well understood and are still poorly documented

Alteration of medieval stained glass windows in atmospheric medium: review and simplified alteration model

International audienceStained glass windows are a precious heritage to pass on to future generations. However, medieval stained glass windows are particularly altered due to their chemical composition and the effects of climatic (mainly water and temperature), environmental (pollution) and biological factors. In this review, we present the alteration patterns observed on ancient Si-K-Ca stained glass windows. To better understand their formation mechanisms and determine the alteration rates, different exposure campaigns to the current atmosphere in a position sheltered from rain or not and laboratory experiments in aqueous medium or in gaseous phase have been conducted. Either model glass or ancient stained glass windows were studied. Isotopic tracers (D, 18 O, 29 Si) have been used as they constitute a powerful tool to elucidate the involved processes and to measure their kinetics. Thanks to all of these data, an alteration scenario of medieval stained glass alteration is proposed. Besides, the extrapolation of kinetic data based on several hypotheses over seven centuries gives very consistent results compared to the ancient stained glass samples