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  2. Conservation and restoration of copper-based objects

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

    The prevention and removal of surface dirt and corrosion products are the primary concerns of conservator-restorers when dealing with copper or copper-alloy objects. Perseus with the Head of Medusa , bronze, by Benvenuto Cellini, in the Loggia dei Lanzi gallery on the edge of the Piazza della Signoria in Florence; picture taken after the statue ...

  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. Bronze disease - Wikipedia

    en.wikipedia.org/wiki/Bronze_disease

    The sesquicarbonate may remove copper from the artefact as it forms a complex ion with copper. Amateurs report that the patina may be stripped from the artefact but this is when the solution is boiled so that the carbonate rinse removes the chlorides in hours rather than the cool bath of long duration used by professional conservators. [2] [3]

  5. Conservation and restoration of metals - Wikipedia

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

    Similar to many other bronze statues, the statue of Joseph of Portugal had an interventive conservation treatment. The conservation decision made to remove the patina most likely happened for two reasons. Firstly, it improves the visual impression of the statue; and secondly, the patina is a corrosive process slowly destroying the metal.

  6. Patina - Wikipedia

    en.wikipedia.org/wiki/Patina

    Figuratively, patina can refer to any fading, darkening, or other signs of age, which are felt to be natural or unavoidable (or both). The chemical process by which a patina forms or is deliberately induced is called patination, and a work of art coated by a patina is said to be patinated. Copper weather vane with verdigris patina

  7. Liver of sulfur - Wikipedia

    en.wikipedia.org/wiki/Liver_of_sulfur

    The reactivity of liver of sulfur with silver and copper quickly creates a dark or colored patina on the metal. This is done by immersing the metal object in a solution of liver of sulfur and water. When treating silver, the solution must be hot, though if the bath is brought to its boiling point the liver of sulfur will quickly decompose and ...

  8. Pickling (metal) - Wikipedia

    en.wikipedia.org/wiki/Pickling_(metal)

    Pickling is a metal surface treatment used to remove impurities, such as stains, inorganic contaminants, and rust or scale from ferrous metals, copper, precious metals and aluminium alloys. [1] A solution called pickle liquor, which usually contains acid, is used to remove the surface impurities.

  9. Chemical coloring of metals - Wikipedia

    en.wikipedia.org/wiki/Chemical_coloring_of_metals

    Brown or black can be used as a base color for copper patina. If the amount of chlorides decreases the color will be more bluish-green, if carbonate decreases, more yellow-[27] Black for copper. Solution of sodium polysulfide 2.5%, items must be submerged in the solution after color developing, wash, dry and wax or varnish colored object. [28]