Degue Saffron Yellow Glass Vase

• Knop (glass) - In Georgian glassware, the knop is a bulbous protrusion, usually midway up the stem of the glass. It may be included singly or in groups, and may be hollow or solid. There are many styles of knop including basal, baluster, bell, acorn, cone, flattened, melon and mushroom.
• Etched - Glass decorated with an etched design, which is achieved through marking out the pattern, protecting the area that is not be etched, and then immersing the object in acid to dissolve the surface of the unprotected area. With some glass objects, such as cameo glass, there may be several layers of different coloured glass, and part of the top layer is dissolved leaving the bottom layer as the background. The longer the time of exposure of the object to acid, the deeper the etching.
  
  The word etching is also sometimes used to describe another method of decoration, where wheel grinders were used decorate the surface, but this technique is usually known as engraving.
• Cased Glass - Cased glass is a type of glassware that is made by sandwiching a layer of one colour of glass between two layers of another colour of glass. This technique is also known as "slip-casting" and "slip-decorated" or "overlay" glass. The process creates a decorative effect by contrasting the colours of the outer layers with the inner layer. The outer layers can be clear, opaque or coloured and the inner layer can be a different colour, or it can be left clear to create a more subtle effect.
  
  The technique was first developed in the 19th century, primarily in Europe, and it was used to produce a wide range of decorative glassware such as vases, bowls, and bottles. Cased glass was particularly popular during the Art Nouveau period, when many glassmakers, including Loetz, Galle, Steuben and Tiffay began to experiment with different colours and designs to create unique and striking pieces of glassware.
• 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.
• Baluster (glass) - An architectural term for a column in a balustrade or staircase.
  
  When used to describe glass, it can either refer to the shape of the stem of a wine glass, being slender above and pear shaped below, or the shape of the whole vessel, usually a vase. In fact the baluster shape is often described as being vase-like.
  
  The description of a vase as being of baluster shape covers a wide variety of shapes that often bear no resemblance to the original architectural form.
• 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.
  
  

This item has been included into following indexes:

• Degue (France) - glass makers 20