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Patina is also found on slip rings and commutators. This type of patina is formed by corrosion, what elements the air might hold, residue from the wear of the carbon brush, and moisture; thus, the patina needs special conditions to work as intended. Patinas can also be found in woks or other metal baking dishes.
The Statue of Liberty, showing advanced patination; verdigris is responsible for the statue's iconic green colour.. Verdigris (/ ˈ v ɜːr d ɪ ɡ r iː (s)/) [1] is a common name for any of a variety of somewhat toxic [2] [3] [4] copper salts of acetic acid, which range in colour from green to a bluish-green depending on their chemical composition.
1 Etymology. 2 Characteristics ... copper was mined principally on Cyprus, the origin of the name of ... The final patina is a particularly durable layer that is ...
Possibly from Greek ἀντί + μόνος (anti + monos), approximately meaning "opposed to solitude", as believed never to exist in pure form, or ἀντί + μοναχός (anti + monachos) for "monk-killer" (in French folk etymology, anti-moine "monk's bane"), because many early alchemists were monks, and antimony is poisonous.
Unlike wear patina necessary in applications such as copper roofing, outdoor copper, bronze, and brass statues and fittings, chemical patina is considered a lot more uneven and undesirable. [2] Patina is the name given to tarnish on copper-based metals, while toning is a term for the type of tarnish which forms on coins.
Rather than wearing out, it develops a patina during its useful lifetime. It is usually considered the highest quality leather. Furniture and footwear are often made from full-grain leather. Full-grain leather is typically finished with a soluble aniline dye. Russia leather is a form of full-grain leather.
Platinum finds use in jewellery, usually as a 90–95% alloy, due to its inertness. It is used for this purpose for its prestige and inherent bullion value. Jewellery trade publications advise jewellers to present minute surface scratches (which they term patina) as a desirable feature in an attempt to enhance value of platinum products. [80] [81]
Greenspan is a typically Ashkenazi Jewish surname. It is the anglicized form of the German/Yiddish surname Grünspan ("green swarf", "green patina", "verdigris ...