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Pontil scar on the base of a free-blown glass bowl. A pontil mark or punt mark is the scar where the pontil, punty or punt was broken from a work of blown glass.The presence of such a scar indicates that a glass bottle or bowl was blown freehand, while the absence of a punt mark suggests either that the mark has been obliterated or that the work was mold-blown.
Brown glass jars with some clear lab glassware in the background Laboratory glassware may be made from several types of glass , each with different capabilities and used for different purposes. Borosilicate glass is a type of transparent glass that is composed of boron oxide and silica, its main feature is a low coefficient of thermal expansion ...
Here's your guide to identifying whether your glass is vintage or antique, plus how to spot rare art glass, according to experts. ... How to Identify Antique and Vintage Glassware Massimo Ravera ...
Inscribing marks on the manufactured items was likely a precursor of communicative writing. [4] Historically, the marks were used for few purposes: [5] declaration of the ownership (an ownership mark, for example, livestock branding [6]); identification of the manufacturer and place of origin (manufacturer's mark, maker's mark, later a factory ...
These flasks are usually pear-shaped, with a flat bottom, and made of glass or plastic. The flask's mouth is either furnished with a plastic snap/screw cap or fitted with a joint to accommodate a PTFE or glass stopper. The neck of volumetric flasks is elongated and narrow with an etched ring graduation marking. The marking indicates the volume ...
Shipping symbols [2] from ISO standard 780 "Pictorial marking for handling of goods" [3] or ASTM D5445 "Standard Practice for Pictorial Markings for Handling of Goods" [4] which depict shipping boxes as squares with rounded corners: "Fragile": the silhouette of a broken wine glass "This end up": a horizontal line with two arrows pointing up
Glass databases are a collection of glass compositions, glass properties, glass models, associated trademark names, patents etc. These data were collected from publications in scientific papers and patents, from personal communication with scientists and engineers, and other relevant sources.
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