If one of the intervening states was a superpower, a civil war is a further 72% longer; a conflict such as the Angolan Civil War, in which there is two-sided foreign intervention, including by a superpower (actually, two superpowers in the case of Angola), would be 538% longer on average than a civil war without any international intervention.
Shellac is a wood finishing product made by dissolving dried resin in denatured alcohol. Shellac was used heavily for finishing furniture during the 19th and early 20th centuries, and it is still available for use today. The product is popular due to its ease of application, low odor, and all-natural origin.
Traditional Shellac. Shellac is a penetrating varnish that's been used on American table tops since Colonial days. A shellac finish allows you to view the wood detail with remarkable clarity. Amber shellac provides the same clarity but it also adds warmth to light-colored woods such as pine or oak. properly protected wood table will last for generations, yet the table top is particularly vulnerable to scratching, scraping and moisture. Sealing that surface requires a tough, transparent water-resistant coating that highlights the beauty of the wood beneath.