Fig. 5From: Protecting silver cultural heritage objects with atomic layer deposited corrosion barriersXPS imaging of knife tarnish spot: Analysis of a tarnish spot visible on 10 nm Al2O3 ALD coated silver knife blade after 1 year ambient aging with (b) SEM image and c XPS imaging with overlain quantified line profile of O 1s, Al 2p, S 2p and Ag 3d spectra. The tarnish spot corresponds to a defect or hole in the Al2O3 ALD coating. Knife Side A shown in this imageBack to article page