Tarnish - definição. O que é Tarnish. Significado, conceito
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O que (quem) é Tarnish - definição

THIN LAYER OF CORROSION THAT FORMS OVER COPPER, BRASS, ALUMINUM, MAGNESIUM, NEODYMIUM AND OTHER SIMILAR METALS AS THEIR OUTERMOST LAYER UNDERGOES A CHEMICAL REACTION
Tarnishing
  • oxidized]] with colorful tarnish

tarnish         
¦ verb
1. lose or cause to lose lustre, especially as a result of exposure to air or moisture.
2. make less valuable or respected: they make up negative stories to tarnish my image.
¦ noun loss of brightness.
?a film or stain formed on an exposed surface of a mineral or metal.
Derivatives
tarnishable adjective
Origin
ME: from Fr. terniss-, lengthened stem of ternir, from terne 'dark, dull'.
tarnish         
I. v. a.
Soil, stain, sully, deface, dim, discolor, dull, blemish.
II. n.
Soil, stain, spot, blemish, blot.
Tarnish         
·noun The quality or state of being tarnished; stain; soil; blemish.
II. Tarnish ·vi To lose luster; to become dull; as, gilding will tarnish in a foul air.
III. Tarnish ·noun A thin film on the surface of a metal, usually due to a slight alteration of the original color; as, the steel tarnish in columbite.
IV. Tarnish ·adj To soil, or change the appearance of, especially by an alternation induced by the air, or by dust, or the like; to diminish, dull, or destroy the luster of; to Sully; as, to tarnish a metal; to tarnish gilding; to tarnish the purity of color.

Wikipédia

Tarnish

Tarnish is a thin layer of corrosion that forms over copper, brass, aluminum, magnesium, neodymium and other similar metals as their outermost layer undergoes a chemical reaction. Tarnish does not always result from the sole effects of oxygen in the air. For example, silver needs hydrogen sulfide to tarnish, although it may tarnish with oxygen over time. It often appears as a dull, gray or black film or coating over metal. Tarnish is a surface phenomenon that is self-limiting, unlike rust. Only the top few layers of the metal react. The layer of tarnish seals and protects the underlying layers from reacting.

Tarnish actually preserves the underlying metal in outdoor use, and in this form is called patina. The formation of patina is necessary in applications such as copper roofing, and outdoor copper, bronze, and brass statues and fittings. 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.

Exemplos do corpo de texto para Tarnish
1. We oppose attempts to tarnish Russias position," Assad said.
2. This will tarnish the reputation of the profession," she said.
3. An arrest would demoralize and tarnish his image.
4. The arrests are sure to further tarnish Uribe‘s government.
5. "I suppose that, with it being gold, it doesn‘t tarnish.