Tarnish

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tarnish

[′tär·nish]
(metallurgy)
Discoloration of a metal surface due to the formation of a thin film of oxide, sulfide, or some other corrosion product.
(mineralogy)
The altered color and luster of a mineral surface; characteristic of copper-bearing minerals.

Tarnish

 

the variegated, often iridescent, coloring of a thin surface layer of a mineral, differing sharply from the color of the rest of the mineral. Tarnish is caused by the presence, on the surface of the mineral grains, of a thin film formed as a result of the alteration of the mineral, for example, under exposure to oxygen. The film often produces an iridescent effect. Tarnish is typical of bornite, chalcopyrite, limonite, and other minerals. It is not observed on a fresh surface of mineral breakage.

tarnish

An oxide layer on a metal surface that causes it to dull, often discoloring it.
References in periodicals archive ?
The victim said, "My school has suspended my admission saying their reputation can be tarnished if I continue to study here.
ANZ (NYSE: ANZ) chief executive Shayne Elliott has said that big commercial banks in the nation were tarnished by the recent money-laundering allegations against Commonwealth Bank of Australia (CBA:ASX).
Among the useful ideas presented in Tarnished is that toxic leadership is best viewed along a spectrum.
We're just worried a computer glitch might have tarnished the reputation of the run.
Summary: A campaign on the actual viewpoint the UAE has on human rights, which has been tarnished by foreign reports that are erroneous and prejudiced, will be launched shortly.
TARNISHED silverware: To clean grime and tarnish from your cutlery, first line the kitchen sink with a sheet of tin foil, and fill it with hot water.
He called for increased awareness to change the mindset of extremism and terrorism due to which countrys image is being tarnished in comity of nations.
Jim Kudlinkski (author); THE TARNISHED FED; Vantage Press (Business & Economics) $16.
However, analysis of the elements present on the surface showed that where the coin was tarnished, there were high concentrations of silver and sulfur.
Researchers visited more than 80 sites in Texas along roadsides and cotton fields at least twice a week for 3 years and found 13 previously unreported host plants for tarnished plant bugs and 8 for cotton fleahoppers.
The First Minister said he was "disappointed" that the Prime Minister's pledge to pursue a "respect agenda" was already tarnished.
He held the Iraqi agriculture ministry responsible for tarnished reputation of one of Iraq's top products and national wealth.