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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.
This is a particularly badly formed sentence because rust on weathering steel is a patina. It should be removed, it is not important to the article and is misleading. If you want to make the point that rust on an object to be restored is not desirable and should not be considered a patina I am all for it.
In addition to explaining, antique experts also offer their tips for dealing with each on your collectibles.
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.
"All that glitters is not gold" is an aphorism stating that not everything that looks precious or true turns out to be so.. While early expressions of the idea are known from at least the 12th–13th century, the current saying is derived from a 16th-century line by William Shakespeare, "All that glisters is not gold".
The final patina is a particularly durable layer that is highly resistant to atmospheric corrosion, thereby protecting the underlying metal against further weathering. [ 159 ] [ 160 ] [ 161 ] It can be a mixture of carbonate and sulfate compounds in various amounts, depending upon environmental conditions such as sulfur-containing acid rain.
Jacobovici suggests the James Ossuary could be the missing one. According to the film, "recent tests conducted at the CSI Suffolk Crime lab in New York demonstrate that the patina (a chemical film encrustation on the box) from the James ossuary matches the patina from the other ossuaries in the Talpiot tomb."
Desert varnish on gibber, Central Australia . Desert varnish or rock varnish is an orange-yellow to black coating found on exposed rock surfaces in arid environments. Desert varnish is approximately one micrometer thick and exhibits nanometer-scale layering. [1]