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Coin cleaning is the controversial process of removing undesirable substances from a coin's surface in order to make it more attractive to potential buyers. The subject is disputed among the numismatic community whether cleaning coins is necessary. Those that argue in favor of cleaning are also in dispute on which methods work best.
Bronze disease is an irreversible and nearly inexorable corrosion process that occurs when chlorides come into contact with bronze or other copper-bearing alloys. [ 1 ] It can occur as both a dark green coating, or as a much lighter whitish fuzzy or furry green coating. [ 1 ] It is not a bacterial infection, but the result of a chemical ...
This will give the vinegar and salt enough time to react with the rust and loosen its grip on the surface. Step 4: Scrub Off the Rust After soaking, take a metal brush or steel wool pad and scrub ...
Bronze is an alloy consisting primarily of copper, commonly with about 12–12.5% tin and often with the addition of other metals (including aluminium, manganese, nickel, or zinc) and sometimes non-metals, such as phosphorus, or metalloids, such as arsenic or silicon. These additions produce a range of alloys that may be harder than copper ...
Trifolium repens. Trifolium biasolettii Steud. & Hochst., syn of subsp. prostratum. Trifolium repens, the white clover, is a herbaceous perennial plant in the bean family Fabaceae (otherwise known as Leguminosae). It is native to Europe, including the British Isles, [2] and central Asia and is one of the most widely cultivated types of clover.
Pitting corrosion. Appearance. Severe pitting corrosion problems caused by chloride ions on a truss beam of the Nandu River Iron Bridge (Hainan Province, China) leading to the complete rupture of a metallic element. Pitting corrosion, or pitting, is a form of extremely localized corrosion that leads to the random creation of small holes in metal.
Trifolium pratense f. pratense. Trifolium pratense var. pratense. Trifolium ukrainicum Opperman. Trifolium pratense (from Latin prātum, meaning meadow), red clover, [2][3] is a herbaceous species of flowering plant in the bean family, Fabaceae. It is native to the Old World, but planted and naturalised in many other regions.
Trifolium arvense, commonly known as the hare's-foot clover, [1] rabbitfoot clover, [2] stone clover or oldfield clover, is a flowering plant in the bean family Fabaceae. This species of clover is native to most of Europe , excluding the Arctic zone, and western Asia , in plain or mid-mountain habitats up to 1,600 metres (5,200 ft) altitude.