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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.
Etymology of the chemical element names Element Original word Language of origin Meaning Nature of origin Name (symbol) Z Description (symbol etymology, former names) Hydrogen (H) 1 ὕδωρ (root: ὑδρ-) + γενής (hydor genes) Greek via Latin and French "water + begetter" descriptive
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.
The weakness of an etymology with εὐρύς (eurus), is 1. that the -u stem of εὐρύς disappears in Εὐρώπη Europa and 2. the expected form εὐρυώπη euryopa that retains the -u stem in fact exists.
Save for Cobain’s sketch, the exterior is a pastiche of spray-can graffiti, dirt, scratches, and rust patina. The upholstery covering its bucket seats is shredded. There’s surface rust on the ...
Hepatizon (Greek etymology: ἧπαρ, English translation: "liver"), also known as black Corinthian bronze, was a highly valuable metal alloy in classical antiquity.It is thought to be an alloy of copper with the addition of a small proportion of gold and silver (perhaps as little as 8% of each), mixed and treated to produce a material with a dark purplish patina, similar to the colour of liver.
Other patina colours such as red, blue or black can also be achieved on copper alloys, and on other metals. Plantsurfer ( talk ) 17:37, 2 April 2008 (UTC) [ reply ] Verdigris Cu(CH3COO)2·[Cu(OH)2]3·2H2O ) > Copper(II) acetate is formed with acid whereas patina is a mixture of alcaline copper compounds.