Abstract

The paper presented by Vavro et al . (2018) is an interesting application of a relatively new technique, X-ray computed micro-tomography (MCT), for the determination of iron sulphides in roofing slates. Once the slate shingles are installed on a roof, these iron sulphides may oxidize, creating unattractive red stains running along the roof surface. This pathology is considered to be the main technical problem for the roofing slate industry (Cardenes et al . 2016 a ). In their paper, Vavro et al . (2018) explain how the use of MCT allows quantification of the amount, size and spatial distribution of the iron sulphides on two samples of roofing slates. However, their work misses some important …

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