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Vegetable oil to get varnish off then soap and water :)
Varnish preserves wood better than paint.
A lot of resins are used in varnishes. Printer's varnish uses copal resin, polyurethane varnish uses polyurethane, amber varnish contains amber.
Depends on the quality and amount you buy. A litre of average varnish is about $9-10 in Canada.
Varnish does not always include shellac. It's usually a combination of a drying oil, a resin, and a thinner. Go to the wikipedia link below to read all about varnish.