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The ancient Romans often used olive oil to seal their stone. Such treatment provides some protection by excluding water and other weathering agents, but it stains the stone permanently. During the renaissance Europeans experimented with the use of topical varnishes and sealants made from ingredients such as egg white, natural resins and silica ...
A model of a late 19th-century Canadian seal used to certify the quality of assayed gold. A metallurgical assay is a compositional analysis of an ore, metal, or alloy, usually performed in order to test for purity or quality. Some assay methods are suitable for raw materials; others are more appropriate for finished goods.
Black oxide for copper, sometimes known by the trade name Ebonol C, converts the copper surface to cupric oxide. For the process to work the surface has to have at least 65% copper; for copper surfaces that have less than 90% copper it must first be pretreated with an activating treatment. The finished coating is chemically stable and very ...
Uranium glass used as lead-in seals in a vacuum capacitor. Glass-to-metal seals are a type of mechanical seal which joins glass and metal surfaces. They are very important elements in the construction of vacuum tubes, electric discharge tubes, incandescent light bulbs, glass-encapsulated semiconductor diodes, reed switches, glass windows in metal cases, and metal or ceramic packages of ...
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“The Wolf of Wall Street” is notable for a few reasons, not least of which is that it is based on a true story. This portrayal of real-life stockbroker Jordan Belfort is based on his 2007 ...
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Özgüç, Nimet. "Seal Impressions from the Palaces at Acemhöyük." In Ancient Art in Seals, edited by Edith Porada, 61-80. Princeton: Princeton University Press, 1980. Özgüç, Nimet. Kültepe-Kaniš/Neša: Seal Impressions on the Clay Envelopes from the Archives of the Native Peruwa and Assyrian Trader Uṣur-Ša-Ištar Son of Aššur-Imittī.
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