Restoration of a medieval knife with your own hands

My friend is engaged in the restoration of old knives. He is given or brought to the recovery found in the forest or in the old settlements of iron rusty knives. He clears them and if the metal is good then re-uses. In our area very often knives from Damascus steel, such knives even after lying 500 years in the earth remain very strong.

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And so look ancient knives after clearing