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  2. Widmanstätten pattern - Wikipedia

    en.wikipedia.org/wiki/Widmanstätten_pattern

    Widmanstätten pattern, metallographic polished section Iron and nickel form homogeneous alloys at temperatures below the melting point ; these alloys are taenite . At temperatures below 900 to 600 °C (depending on the Ni content), two alloys with different nickel content are stable: kamacite with lower Ni-content (5 to 15% Ni) and taenite ...

  3. Conservation and restoration of silver objects - Wikipedia

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

    Once cleaned and dried the silver is wrapped in acid-free tissue paper and placed in a sealed plastic bag. A 3M anti-tarnish strip is also placed in the bag to absorb any sulfur that may be in the air. The tissue paper is used as a buffer to prevent the silver surface coming into contact with the anti-tarnish strip. [13]

  4. Facial tissue - Wikipedia

    en.wikipedia.org/wiki/Facial_tissue

    The tissue paper might be treated with softeners, lotions or added perfume to get the right properties or "feeling". The finished facial tissues or handkerchiefs are folded and put in pocket-size packages or a box dispenser. Facial tissue may contain non-biodegradable additives for strength. [2]

  5. United States nickel mintage figures - Wikipedia

    en.wikipedia.org/wiki/United_States_nickel...

    Jefferson nickels have been minted since 1938 at the Philadelphia and Denver mints and from the San Francisco mint until 1970. Key dates for the series include the 1939-D, and 1950-D nickels. The 1939-D nickel with a mintage of 3,514,000 coins is the second lowest behind the 1950-D nickel.

  6. Ivory - Wikipedia

    en.wikipedia.org/wiki/Ivory

    Ivory's mechanical properties result from the microstructure of the dentine tissue. It is thought that the structural arrangement of mineralized collagen fibers could contribute to the checkerboard-like Schreger pattern observed in polished ivory samples. [1] This is often used as an attribute in ivory identification.

  7. Nanyue silver box - Wikipedia

    en.wikipedia.org/wiki/Nanyue_silver_box

    The Nanyue silver box (Ch: 南越裂瓣纹银器) is an ancient silver box with lobed decoration (裂瓣纹) discovered in Southern China in the tomb of Emperor Wen of Nanyue (who died in 124 BCE). The object is now located in the Museum of the Mausoleum of the Nanyue King .