mikeK;
The iron preservative is tannin or tannic acid, here, the trappers used to brew up old tea bags and sometime alder leaves, dip the steel traps in it and it would make a hard, black coating that kept traps from rusting in our numerous winter (Chinooks) winter warm spells, and during spring beavering.
It seems to me this is happening naturally, in the oak forests. Acorns are loaded with tannin, enough so, to eventually destroy the kidneys of pigs that eat a lot of them.
Do you have stands of alder? If so, check that out and see if alder tannin does as well.
Are these ancient stands of trees or planted since Roman times?
goldigger (Brian)
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