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Wood finishing is one of the most traditional and still popular uses of shellac mixed with solvents or alcohol. This dissolved shellac liquid, applied to a piece of wood, is an evaporative finish: the alcohol of the shellac mixture evaporates, leaving behind a protective film. [39] Shellac as wood finish is natural and non-toxic in its pure form.
French polishing a table. French polishing is a wood finishing technique that results in a very high gloss surface, with a deep colour and chatoyancy.French polishing consists of applying many thin coats of shellac dissolved in denatured alcohol using a rubbing pad lubricated with one of a variety of oils.
Relative to oil or shellac varnishes, polyurethane varnish forms a harder film which tends to de-laminate if subjected to heat or shock, fracturing the film and leaving white patches. This tendency increases when it is applied over softer woods like pine. This is also in part due to polyurethane's lesser penetration into the wood.
Natural-looking options include stains, shellac, waxes and polishes. “Shellac, a natural raw material obtained from the excretions of lac insects, is often used in antique furniture restoration ...
Wood finishing starts with sanding either by hand, typically using a sanding block or power sander, scraping, or planing. Imperfections or nail holes on the surface may be filled using wood putty or pores may be filled using wood filler. Often, the wood's color is changed by staining, bleaching, or any of a number of other techniques.
In India shellac derived from insect lac was used since ancient times. Shellac is the secretion of the lac bug (Tachardia lacca Kerr. or Laccifer lacca). It is used for wood finish, lacquerware, skin cosmetic, ornaments, dye for textiles, production of different grades of shellac for surface coating. [7] [9] [10]
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