And the practise of painting certain fieldwalls in S. Northumberland with burnt ochre survived into the 1950's. It's still fairly distinct in some places. Dark rusty red - the same material was originally used to mark sheep and is recorded by Hardy in " ? " where there's a ruddle seller.
The bowl-carved stone that I know and own - the High Shield dobbie - is fairly soft sandstone. Unless it was calked with something - tallow perhaps - the liquid in there, whatever it was - and I think about blood - just permeates into the stone fairly briskly. In an hour or two in dry weather.
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