Case 4
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Introduction
Staining OF Grooves
Type of Building: Institutional
Dark stains marks are formed below ledges and below large areas. It was prominent on the greyish coloured external facade of Shanghai plaster.
The streaks of stain marks were especially prominent a small distance off the ledge and the intensity grew lesser as the distance increased. On large surface, the stain marks were also present a little off the movement joints and grooves present.