Dating glass containers incorporated bottles

17-May-2014 22:54 by 4 Comments

Dating glass containers incorporated bottles

The main ingredients are silica and carbonates as well as different colorings and stabilizers.It is only in the 20th century that bottles bear letters and numbers that specify anything from the volume to the producer and the EU sign.

Madeira bottles tend to come in many shapes and sizes.Sometimes you will find a sign on the bottle, but normally the bottle is void of any markings.As said above, you could blow the molten glass into a mold, thereby shaping the outside of the glass container.This is just a simplified guide to the dating of antique bottles.If you want to get into detail please take a look at one of the websites that can be found in the bibliography section.The bottles are easy to recognize from the rather rough seams where the parts of the mold got together.

If you take a close look, you might also find signs of tension in the glass of the bottle neck, like stripes or long bubbles in the glass, following the direction of the bottle neck.

In the end of the 19th century then, the method of pressing was developed to perfection and the industrial production of bottles began.

Because of the method, the size and shape of free-blown bottles vary greatly.

The strength of the bottle wall may vary from top to bottom, visible by small variations of transparency of the colored glass.

Also hand blown bottles tend to have a relatively long neck when compared to molded or machine made bottles.

Changes in bottle manufacturing took place over years, so at certain periods of time there were different bottle types in use.