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  2. Vetrazzo - Wikipedia

    en.wikipedia.org/wiki/Vetrazzo

    Vetrazzo recycled glass countertops were invented in Berkeley in 1996. A materials scientist, Don McPherson, pursuing his PhD combined recycled glass and a cement binder to create a sustainable, polished countertop. The company at that time was known as Counter Productions.

  3. Conservation and restoration of silver objects - Wikipedia

    en.wikipedia.org/wiki/Conservation_and...

    Tarnish is a chemical reaction on the surface of metal (copper, brass, silver, etc.) and causes a layer of corrosion. In the case of silver tarnish, the silver combines with sulfur and forms silver sulfide (Ag 2 S), which is black. The original silver surface can be restored if the layer of silver sulfide is removed. [4]

  4. Tarnish - Wikipedia

    en.wikipedia.org/wiki/Tarnish

    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 ...

  5. Terrazzo - Wikipedia

    en.wikipedia.org/wiki/Terrazzo

    Recycled aggregates include: glass, porcelain, concrete, and metal. Shapes and medallions can be fabricated on site by bending divider strips, or off site by water-jet cutting. When the terrazzo is thoroughly cured, helpers grind it with a terrazzo grinder, which is somewhat like a floor polisher, only much heavier.

  6. Engineered stone counter tops are killing workers at high ...

    www.aol.com/news/engineered-stone-counter-tops...

    If the counter tops are cut or sanded in the home, the consumer can be exposed to a small amount of silica but the workers face the most serious health problems, Gandhi said.

  7. Patina - Wikipedia

    en.wikipedia.org/wiki/Patina

    Patina (/ p ə ˈ t iː n ə / pə-TEE-nə or / ˈ p æ t ɪ n ə / PAT-ih-nə) is a thin layer that variously forms on the surface of copper, brass, bronze, and similar metals and metal alloys (tarnish produced by oxidation or other chemical processes), or certain stones [1] and wooden furniture (sheen produced by age, wear, and polishing), or ...

  8. Engineered stone - Wikipedia

    en.wikipedia.org/wiki/Engineered_stone

    Continuous exposure to UV can cause discoloration of the stone, and breakdown of the resin binder. The material is sometimes damaged by direct application of heat. Quartz engineered stone is less heat resistant than other stone surfaces including most granite, marble and limestone; but is not affected by temperatures lower than 150 °C (300 °F).

  9. Flame polishing - Wikipedia

    en.wikipedia.org/wiki/Flame_polishing

    Flame polishing, also known as fire polishing, is a method of polishing a material, usually glass or thermoplastics, by exposing it to a flame or heat. [1] When the surface of the material briefly melts, surface tension smooths the surface. Operator skill is critical with this method.

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