Process for boiling Linseed Oil from recipes of Italian varnish making of around 1550, which recommend that oil is heated until it can scorch a feather.
This boiled oil can be used in violin varnish as opposed to commercially available "boiled oil" which is unsuitable for varnish making.
Please don't try this without necessary safety equipment!
Негізгі бет Boiling Linseed Oil to Scorch a Feather
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