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  2. Bulla (seal) - Wikipedia

    en.wikipedia.org/wiki/Bulla_(seal)

    A bulla (or clay envelope) and its contents on display at the Louvre. Uruk period (4000–3100 BC).. A bulla (Medieval Latin for "a round seal", from Classical Latin bulla, "bubble, blob"; plural bullae) is an inscribed clay, soft metal (lead or tin), bitumen, or wax token used in commercial and legal documentation as a form of authentication and for tamper-proofing whatever is attached to it ...

  3. Hermetic seal - Wikipedia

    en.wikipedia.org/wiki/Hermetic_seal

    A hermetic seal is any type of sealing that makes a given object airtight (preventing the passage of air, oxygen, or other gases).The term originally applied to airtight glass containers but, as technology advanced, it applied to a larger category of materials, including metals, rubber, and plastics.

  4. Coiling (pottery) - Wikipedia

    en.wikipedia.org/wiki/Coiling_(pottery)

    Making a pot with the coiling technique. Coiling is a method of creating pottery. It has been used to shape clay into vessels for many thousands of years. It is found across the cultures of the world, including Africa, Greece, China, and Native American cultures of New Mexico. Using the coiling technique, it is possible to build thicker or ...

  5. Terracotta - Wikipedia

    en.wikipedia.org/wiki/Terracotta

    Unglazed terracotta is suitable for use below ground to carry pressurized water (an archaic use), for garden pots and irrigation or building decoration in many environments, and for oil containers, oil lamps, or ovens. Most other uses require the material to be glazed, such as tableware, sanitary piping, or building decorations built for ...

  6. Chemical coloring of metals - Wikipedia

    en.wikipedia.org/wiki/Chemical_coloring_of_metals

    The metal to color should be completely free from oxide and grease. Protective clothing, gloves and goggles should be used in a well-ventilated area or outdoors. Black for silver . Items are immersed in a 2.5% solution of potassium or sodium sulfide, after the appearance of the color wash objects well and wax or varnish it. [26]

  7. Glossary of pottery terms - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_pottery_terms

    A suspension of clay, clay body or glaze in water.( Slip casting A technique for shaping an article by pouring a deflocculated, high-solids content slip into a porous, often plaster, mould Slipware pottery where decoration in slip is a main feature. Includes slip-painting, slip-trailing, and many other techniques Slop Another name for slurry ...

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