I have a very old book called *Lees Priceless Remedies* which is pretty much a DIY guide for the 19th century. In it is a recipe for “everlasting fence posts” which recommends you soak your posts in a mixture of raw linseed oil and pulverised charcoal. The Japanese use a technique where they char the outer face of timber so it’s basically pure charcoal. Apparently this makes the timber underneath less liable to rot or insect attack.
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