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Sodium hydroxide, also known as lye and caustic soda, [1] [2] is an inorganic compound with the formula NaOH.It is a white solid ionic compound consisting of sodium cations Na + and hydroxide anions OH −.
Glass disease, also referred to as sick glass or glass illness, is a degradation process of glass that can result in weeping, crizzling, spalling, cracking and fragmentation. [ 1 ] [ 2 ] Glass disease is caused by an inherent instability in the chemical composition of the original glass formula. [ 3 ]
The volume of a particular material or compound is affected by ambient moisture and may be considered its coefficient of hygroscopic expansion (CHE) (also referred to as CME, or coefficient of moisture expansion) or the coefficient of hygroscopic contraction (CHC)—the difference between the two terms being a difference in sign convention.
HAIFA, Israel (AP) — As her 4-year-old son perused the Israeli museum’s ancient artifacts, Anna Geller looked away for just a moment. Then a crash sounded, a rare 3,500-year-old jar was broken ...
Prunt – a small blob of glass fused to a piece of glass, often impressed with a pattern or stamp; Punty – occasionally pontil, a solid metal rod, around 5 feet long, used to hold an object being blown or hot-worked after it is removed from the blowpipe. Reticello – Italian decorative glassblowing technique. This involves the merging of ...
The objects are usually excavated from archaeological sites in broken pieces, or shards, and then reassembled. Some have been discovered intact in tombs. Professional conservator-restorers , often in collaboration with curators and conservation scientists , undertake the conservation-restoration of ancient Greek pottery.
A 3,500-year-old jar was completely shattered by a five-year-old visitor at a museum in Haifa in the Middle East. Footage of the incident has gone viral on social media, leaving people baffled ...
Greek glass alabastron, probably made in Italy in 1st/2nd century BC, and now part of the Campana Collection of the Musée du Louvre.. An alabastron / ˌ æ l ə ˈ b æ s t r ə n,-ˌ t r ɒ n / or alabastrum / ˌ æ l ə ˈ b æ s t r ə m / (plural: alabastra or alabastrons; from the Greek ἀλάβαστρον) [1] is a small type of pottery or glass vessel used for holding oil, especially ...