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<p>[QUOTE=&quot;2manybooks, post: 9760756, member: 8267&quot;]French polish as a technique involves multiple thin coats, with rubbing/buffing between coats. &quot;French polishing consists of applying many thin coats of <a href="https://en.wikipedia.org/wiki/Shellac" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/Shellac" rel="nofollow">shellac</a> dissolved in <a href="https://en.wikipedia.org/wiki/Denatured_alcohol" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/Denatured_alcohol" rel="nofollow">denatured alcohol</a> using a rubbing pad <u>lubricated with one of a variety of oils</u>.&quot;&nbsp; <a href="https://en.wikipedia.org/wiki/French_polish#:~:text=French%20polishing%20is%20a%20wood,of%20a%20variety%20of%20oils" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/French_polish#:~:text=French%20polishing%20is%20a%20wood,of%20a%20variety%20of%20oils" rel="nofollow">https://en.wikipedia.org/wiki/French_polish#:~:text=French polishing is a wood,of a variety of oils</a>. </p><p><br /></p><p>It may be that the oils and/or multiple thin coats that are used in French polish create different ageing properties. </p><p><br /></p><p>The shellac finish on household woodwork was a simpler process. As noted in the article I linked to, the deteriorated coatings remain soluble in alcohol, indicating this was the original solvent. Shellac was a very common varnish before the development of synthetic resins. I have also seen similar crazing/alligatoring on scientific instruments where tinted shellac was often used as a lacquer coating.[/QUOTE]</p><p><br /></p>

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