Making and Knowing
A minimal edition of BnF Ms Fr 640 in English Translation

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Varnish

Turpentine oil: turpentine & good eau de vie, to dry it out; heat it without mixing on the stove, so that it mixes of its own accord in melting. After, test it on a very clean blade, & you will know from this whether it has enough body and whether it does not flow too much.