another simple way to get the Tannic acid referred to in the link is to take leaves after they've turned completely brown, oak leaves are very good for this. pulverize and soak a pile of it in water for a week or so. use just enough water to cover the leaves. warming the water will speed up the process.
(a covered black container left in the sun works)
the tea-like liquid left is a tannic acid-H2O solution. the less water the better the final mix with vinegar will be.
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