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  2. Porta Nigra - Wikipedia

    en.wikipedia.org/wiki/Porta_Nigra

    The Porta Nigra (Latin for black gate), referred to by locals as Porta, is a large Roman city gate in Trier, Germany.It is a UNESCO World Heritage Site. [2]The name Porta Nigra originated in the Middle Ages due to the darkened colour of its stone; the original Roman name has not been preserved.

  3. Yett - Wikipedia

    en.wikipedia.org/wiki/Yett

    Yett hanging in the main entrance of Blackness Castle, Scotland, showing attached bolts and pierced construction.Wrought in 1693. [1]A yett (from the Old English and Scots language word for "gate") [2] is a gate or grille of latticed wrought iron bars used for defensive purposes in castles and tower houses. [3]

  4. Chemical coloring of metals - Wikipedia

    en.wikipedia.org/wiki/Chemical_coloring_of_metals

    It can be used on copper and its alloys, silver, nickel, iron, gold. The color depends on the duration of immersion, the sequence of colors on brass: Golden yellow-copper-purple-dark, blue-light, blue-chrome-nickel-red-grey, blue, and gray-black to iron or carbon steel. [32]

  5. Japanning - Wikipedia

    en.wikipedia.org/wiki/Japanning

    Japanning is most often a heavy black lacquer, almost like enamel paint. Black is common, and japanning is often synonymous with black japanning. The European technique uses varnishes that have a resin base, similar to shellac, applied in heat-dried layers which are then polished, to give a smooth glossy finish. It can also come in reds, greens ...

  6. Powder coating - Wikipedia

    en.wikipedia.org/wiki/Powder_coating

    Powder coated bicycle frames and parts. The powder coating process was invented around 1945 by Daniel Gustin and received US Patent 2538562 in 1945. [4] This process coats an object electrostatically and then cures it with heat, creating a finish harder and tougher than conventional paint.

  7. Picture frame - Wikipedia

    en.wikipedia.org/wiki/Picture_frame

    View of a frame-maker's workshop, oil on canvas, circa 1900 The elaborate decoration on this frame may be made by adhering molded plaster pieces to the wood base.. A picture frame is a container that borders the perimeter of a picture, and is used for the protection, display, and visual appreciation of objects and imagery such as photographs, canvas paintings, drawings and prints, posters ...