Stone Wall 3 – Natural colour, pattern, and texture in native Cornish rocks in building walls, including igneous and metamorphic rocks, granites and slates, from the region around St Ives.
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Jessica's Nature Blog 
The black looks like tar. I’m I correct?
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Yes, tar or bitumen. I think the entire wall must have been weatherproofed with it at one time but now that has mostly worn away and the surfaces re-pointed.
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