We have been importing sandstone cladding from India for the last 2 years and have just started to observe problems with some of the tiles discolouring to brown or black. This has occurred 4 months post-installation of an exterior wall. We did not carry out the install but we know that the sandstone was sealed when it was still wet. Most tiles are unaffected but about 5% have developed a brown to black discolouring. We just received more stone from our supplier and noticed organic matter (fungus) on the timber crates. Is it possible that the stain is organic and is triggered by moisture? The next question is - how can we treat this problem? I can suppy a couple of photos of the affected tiles.
Thanks,
PJ
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