Tarnish

Tarnish

"Tarnish" is a layer of corrosion that develops over copper,
brass, silver, aluminum as well as a degree of semi-reactive metals as they undergo oxidation. It is analogous to rust, but with soap

Prevention

In objects which are primarily for display rather than use, the tarnishing process can be prevented in the long term by tinning, a process by which the reactive substance is coated in a non-reactive substance, such as tin or wax, and thus protected from oxygen.Fact|date=September 2007

For more frequently used items such as silverware, tarnish is easily prevented by constant use and washing with a mild dish soap.Fact|date=September 2007

Removal

"This kitchen version of electrostripping is safe and easy. It's especially useful for removing tarnish from flatware and holloware. In a pot lined with aluminum foil, mix a diluted solution of equal parts of baking soda salt, and liquid soap. A quarter cup of each to a gallon of water is a typical mixture. Set the sterling in the pot; bring the mix to a simmer and allow it to stand for 10-20 minutes as the oxides are transferred to the aluminum, which you'll see is darkened. Throw that away and wash the silver before using it". [ (McCreight, Tim. "The Complete Metalsmith". Brynmorgen Press Inc., Portland, Maine. 2004.)]

Another way to treat tarnish is to put a drop of water and some fluoride toothpaste on a tissue and rub it on the affected metal.Fact|date=September 2007 This method requires that the toothpaste contain SnF2 (stannous fluoride). However, it is currently (2008) much more usual to find fluoride toothpaste with NaF (sodium fluoride).

References


Wikimedia Foundation. 2010.

Игры ⚽ Нужна курсовая?
Synonyms:
, , , , , , , , , , , ,


Look at other dictionaries:

  • Tarnish — Tar nish, v. t. [imp. & p. p. {Tarnished}; p. pr. & vb. n. {Tarnishing}.] [F. ternir, fr. OHG. tarnen to darken, to conceal, hide; akin to OS. dernian to hide, AS. dernan, dyrnan, OHG. tarni hidden, OS. derni, AS. derne, dyrne. Cf. {Dern}, a.,… …   The Collaborative International Dictionary of English

  • Tarnish — Tar nish, v. i. To lose luster; to become dull; as, gilding will tarnish in a foul air. [1913 Webster] Till thy fresh glories, which now shine so bright, Grow stale and tarnish with our daily sight. Dryden. [1913 Webster] …   The Collaborative International Dictionary of English

  • Tarnish — Tar nish, n. 1. The quality or state of being tarnished; stain; soil; blemish. [1913 Webster] 2. (Min.) 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. [1913… …   The Collaborative International Dictionary of English

  • tarnish — [tär′nish] vt. [< Fr terniss , inflectional stem of ternir, to make dim < MFr, prob. < OHG tarnjan, to conceal < tarni, hidden] 1. to dull the luster of or discolor the surface of (a metal) as by exposure to air 2. a) to besmirch or… …   English World dictionary

  • Tarnish — Tarnish. См. Помутнение поверхности. (Источник: «Металлы и сплавы. Справочник.» Под редакцией Ю.П. Солнцева; НПО Профессионал , НПО Мир и семья ; Санкт Петербург, 2003 г.) …   Словарь металлургических терминов

  • tarnish — I verb asperse, befoul, blacken, blemish, blot, brand, cloud, contaminate, corrode, darken, deface, defame, degrade, denigrate, desecrate, dim, dirty, discolor, discredit, disgrace, dishonor, dull, fade, foul, inquinare, lose luster, maculate,… …   Law dictionary

  • tarnish — vb *soil, dirty, sully, foul, befoul, smirch, besmirch, grime, begrime Analogous words: darken, dim, bedim, *obscure: defile, pollute, taint, *contaminate Antonyms: polish Contrasted words: cleanse, *clean: *illuminate, illumine, lighten …   New Dictionary of Synonyms

  • tarnish — [v] dirty, corrupt befoul, begrime, blacken, blemish, blot, contaminate, damage, darken, defame, defile, dim, discolor, disgrace, dull, embarrass, grime, harm, hurt, impair, injure, lose luster, lose shine, mar, muddy, pale, pollute, rust,… …   New thesaurus

  • tarnish — ► VERB 1) lose or cause to lose lustre, especially as a result of exposure to air or moisture. 2) make or become less valuable or respected. ► NOUN 1) a film or stain formed on an exposed surface of a mineral or metal. 2) dullness of colour; loss …   English terms dictionary

  • tarnish — [ tɑːnɪʃ] luxuriously plainly tastefully to tarnish elegantly (D; tr.) ( to provide ) to tarnish with (can you tarnish us with the necessary information?) (D; tr.) ( to supply with furniture ) to tarnish with (they tarnished the room with very… …   Combinatory dictionary

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”