Kosta Sommerso Vase by Vicke Lindstrand, Circa 1960
A Kosta optical effect sommerso vase by Vicke Lindstrand, circa 1960, the heavy cased vase in blue, green and clear colours with a spiral decor creating a lattice effect inscribed to the polished pontil, Kosta LH1588, 6.69 in. high, 4.33 in. wide, 2.17 in. deep
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- Sommerso - A method of making cased glass developed in Murano in the 1930s, where one or more layers of transparent coloured glass is encased within a layer of thick clear colourless glass.
- Decor Bois - "Decor bois" is a French term that translates to "wood decor" in English. It refers to decorative elements painted on porcelain items that simulate decorations in timber, such as carvings.
- Pontil Mark - A pontil mark, also known as a pontil scar, is a distinctive mark or scar found on the base of certain types of glass. It is a remnant of the glassblowing process and is particularly associated with handcrafted items made prior to the widespread use of automated manufacturing.
The pontil mark is created during the final stages of production. After the glassblower has shaped and formed the glass object, it is removed from the blowing iron. At this point, the glass object is often attached to a solid rod called a pontil rod or punty for further shaping, finishing, or attaching additional components. The attachment point is typically at the base of the object.
Once the glass item is complete, it is detached from the pontil rod, leaving behind a mark or scar on the base. This mark can take various forms, such as a rough or irregular surface, a concave or slightly recessed area, or a small circular scar. The presence of a pontil mark indicates that the item was handcrafted rather than mass-produced.
Collectors and historians often use pontil marks as clues to determine the age, authenticity, and production methods of glass or ceramic pieces. Different types of pontil marks may suggest different techniques used in the production process. For example, an open pontil mark is one where the scar is left as an exposed, roughened area, while a closed pontil mark occurs when the scar is smoothed or covered in some way. It's important to note that not all handcrafted glass items have pontil marks, as some artisans developed alternative methods for finishing their work. In Edwardian times the pontil mark was oftern ground off leaving a concave circle in the centre of the base of the object.
The use of pontil marks diminished with the advent of industrialization and automated manufacturing processes in the 19th and 20th centuries. - Circa - A Latin term meaning 'about', often used in the antique trade to give an approximate date for the piece, usually considered to be five years on either side of the circa year. Thus, circa 1900 means the piece was made about 1900, probably between 1895 and 1905. The expression is sometimes abbreviated to c.1900.
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