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This slag from Blast Beach has a skin of iron oxide only a few hundred nanometres thick. It holds no blue or purple pigment. The colours come from light reflecting within that thin film, like oil on water. Waste from Seaham's Victorian ironworks, catching the light.
This slag from Blast Beach has a skin of iron oxide only a few hundred nanometres thick. It holds no blue or purple pigment. The colours come from light reflecting within that thin film, like oil on water. Waste from Seaham's Victorian ironworks, catching the light.