Dating old bottles uk
This was done manually at first, later there where automatic blowing machines that used molds to make bottles.These molds where usually made of three parts, sometimes even four parts.
As said above, you could blow the molten glass into a mold, thereby shaping the outside of the glass container.
The modern bottles are often not as heavy anymore as they were like until the 1960ies, and in my opinion the color of the glass also has gone to the brighter side.
There are two main shapes of bottles: Burgundy-shaped bottles and Bordeaux-type bottles, the latter often with a little bulge in the bottle neck.
There are also many other shapes or variations of the two main shapes, especially when it comes to hand blown bottles.
Before 1900 the bottles were sometimes stronger in thickness.