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  2. Bead test - Wikipedia

    en.wikipedia.org/wiki/Bead_test

    The bead test is a traditional part of qualitative inorganic analysis to test for the presence of certain metals. The oldest one is the borax bead test or blister test. It was introduced by Berzelius in 1812. [1] Since then other salts were used as fluxing agents, such as sodium carbonate or sodium fluoride.

  3. Glass bead making - Wikipedia

    en.wikipedia.org/wiki/Glass_bead_making

    Lampworked dichroic glass bead showing thin film application Furnace glass beads. A variant of the wound glass bead making technique, and a labor-intensive one, is what is traditionally called lampworking. In the Venetian industry, where very large quantities of beads were produced in the 19th century for the African trade, the core of a ...

  4. Devitrification - Wikipedia

    en.wikipedia.org/wiki/Devitrification

    In general opaque glass can devit easily as crystals are present in the glass to give its opaque appearance and thus the higher the chance it might devit. Techniques for avoiding devitrification include cleaning the glass surfaces of dust or unwanted residue, and allowing rapid cooling once the piece reaches the desired temperature, until the ...

  5. Boron trioxide - Wikipedia

    en.wikipedia.org/wiki/Boron_trioxide

    Boron trioxide or diboron trioxide is the oxide of boron with the formula B 2 O 3.It is a colorless transparent solid, almost always glassy (amorphous), which can be crystallized only with great difficulty.

  6. Glass - Wikipedia

    en.wikipedia.org/wiki/Glass

    However, red-orange glass beads excavated from the Indus Valley Civilization dated before 1700 BC (possibly as early as 1900 BC) predate sustained glass production, which appeared around 1600 BC in Mesopotamia and 1500 BC in Egypt. [27] [28] During the Late Bronze Age, there was a rapid growth in glassmaking technology in Egypt and Western Asia ...

  7. Prince Rupert's drop - Wikipedia

    en.wikipedia.org/wiki/Prince_Rupert's_drop

    Prince Rupert's drops. Prince Rupert's drops (also known as Dutch tears or Batavian tears) [1] [2] are toughened glass beads created by dripping molten glass into cold water, which causes it to solidify into a tadpole-shaped droplet with a long, thin tail.

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