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Dating bottles by seam

Kimora
Age: 24
Weight: 161
Height: 46
Size: 4
Click "blob" type air venting to view a close-up picture of this unusual venting method on an early to mids Peruvian Bitters bottle San Francisco, CA. All turn-mold bottles also called a "paste mold" are round in cross section since no other shape could be turned or twisted in the mold to produce the seamless body distinctive of these bottles. Milk Bottles - Many milk bottles made with press-and-blow machines from the very early s into at least the s resulted in vertical side mold seams that gradually fade out on the neck distinctly below the base of the finish.
Even a master glassblower gaffer was limited in what could be produced free-blown as the shapes were limited by the techniques that could done via the glassblower lungs, movement of the blowpipe, use of a marver a flat surface and block hollowed out surface , and other hand tools Kendrick These include stretch marks, "straw" lines, slumps and sagging spots, bumps, folds, thin and thick spots in the glass, foreign material imbedded in the glass, and others. Most vent marks are small and hard to photograph - but easy to illustrate. One "type" of bubble that seems to be found only in machine-made bottles is shaped like an upside down "V", i. A third color would yet again require the same process

Dating Antique Bottles

Jasmine
Age: 36
Weight: 162
Height: 51
Size: 3
Using physical, manufacturing related diagnostic features, most utilitarian bottles can usually only be accurately placed within a date range of years i. The four-piece mold is a variation of the three-piece mold with two body halves instead of one; this mold type is discussed in the box below. Multi-sided dip mold bottles pictured below may likely have been made from multi-part dip molds, though side seams showing the interface between the mold pieces are rarely seen, being either masked by the corner edges of the bottle or the bottle body was fire polished to the point that seams are unrecognizable.
One noted example, which was known to have been made in the midth century, was dated - a date that pertained to the implementation of certain wine production laws Jones ; Van den Bossche Upon contact with the very hot glass on the end of the blowpipe some of the water turned to steam. One of the longest running "myths" in the world of bottle dating is that the side mold seam can be read like a thermometer to determine the age of a bottle. Appealing though this notion is, the large majority of molds used to produce bottles during the era covered by this webpage through the s were made of various metals, or in the earlier years, fired clay Van den Bossche Part II - pages , pages , pages , pages , pages
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