ROMAN BLUE RIBBED GLASS BOWL Ca. 100 BC - AD 100 A stunning Roman blue glass ribbed bowl. It is mould-made in a shallow phiale-like form, with a slightly concave base and thick, radiating ribs around the base which terminate just below the smooth rim. The glassware in question is commonly referred to as "pillar-moulded," a term that describes the production method used to shape the bowl. This process involved taking a flat sheet of malleable glass and placing it upside-down into a solid mould, after which the glass was manipulated to conform to the mould and create the ribbed texture on the exterior. Both the interior and exterior surfaces exhibit vibrant areas of silvery and rainbow-coloured iridescence. For similar see: The Metropolitan Museum of Art, Accession Number: 81.10.33. Size: 110mm x 75mm; Weight: 200g Provenance: Prince collection, 1990s-2014; Ex. David Giles. This item has been cleared against the Art Loss Register database and comes with a confirmation letter. This piece is accompanied by a historical report from Alessandro Neri, an international Cultural Heritage expert based in Florence, Italy.