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Resinous glaze is an alcohol-based solution of various types of food-grade shellac.The shellac is derived from the raw material sticklac, which is a resin scraped from the branches of trees left from when the small insect, Kerria lacca (also known as Laccifer lacca), creates a hard, waterproof cocoon. [1]
Shellac comes from shell and lac, a partial calque of French laque en écailles, 'lac in thin pieces', later gomme-laque, 'gum lac'. [5] Most European languages (except Romance ones and Greek) have borrowed the word for the substance from English or from the German equivalent Schellack.
3. Uniform viscosity - this ensures a stronger protective coating that can be applied to the product as a homogeneous layer. 4. Industrial reproduction - because most glazing agents are used on commercial goods and therefore large quantities of glazing agent may be needed.
Shellac does not break down easily with commercially available products. Additionally, the resin has naturally-occurring dyes that can stain ceramic pink or black. The solvent that works best on this resin is Industrial methylated spirit (IMA). [6]: p.31 Shellac is prepared by dissolving flakes of shellac in hot alcohol. The properties of ...
Conservation treatments include dry cleaning, wet cleaning, consolidation and filling losses. Eastern cultures use Asian lacquer to repair damages and fill and consolidate losses. Western cultures typically use alternate materials that can be reversed with minimal risk to the original object.
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Shellac should be considered in two different ways. It is used thinned with denatured alcohol as a finish and as a way to manipulate the wood's ability to absorb other finishes. The alcohol evaporates almost immediately to yield a finish that will attach to virtually any surface, even glass, and virtually any other finish can be used over it.
Shellac is the basis of French polish, which for centuries has been the preferred finish for fine furniture. Specified "dewaxed" shellac has been processed to remove the waxy substances from original shellac and can be used as a primer and sanding-sealer substrate for other finishes such as polyurethanes, alkyds, oils, and acrylics.