Every so often we come across exceptionally old tiles that are in desperate need of restoration. These Slate flagstones at a property in Banbury, Oxfordshire had to be a couple of hundred years old, the grout had come loose and I wagered that it'd been covered by bitumen (also known as asphalt), plaster, and concrete for a significant portion of its life. The property owner was keen to try and restore them and had tried to clean them, only to realise that it was a bigger task than initially
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