Fig. 3From: Monitoring the accumulated water soluble airborne compounds deposited on surfaces of showcases and walls in museums, archives and historical buildingsThe Koppel Wing of the Danish State Archives from the 1960’s, where concrete was the dominant building material. On the left in the photo can be seen the sampling site with the Al-foil still in place (photo: Morten Ryhl-Svendsen)Back to article page