Fostoria American, set of 4 stem and footed offers water glasses, amethyst, purple, irradiated, FREE SHIPPING

4 water glasses all Vintage Fostoria American Amethyst Purple glasses. There are no chips or cracks but they do have a small scratch here and there. They have the expected sun hazing to be expected of something 100 years old.

They are 5.5 inches tall, approximately 3.25 across the opening, and 2.5 on the base. Holds 8 ounces.

Purple/Amethyst Glass and the Irradiation Process:

The beautiful purple color of this glass is caused by the presence of manganese, which was used in early glass production as a de-colorizer to turn the glass clear. Manganese is one of the oldest glass additives, and purple manganese glass was used since early Egyptian history. Around 1915 most glass companies stopped using manganese, substituting selenium as the clearing agent. Glass that contains manganese will turn amethyst/purple when exposed to ultraviolet rays of the sun or other sources of UV rays. When the process of the sun is accelerated by using UV light exposure, it is called “irradiation”. It is a permanent process which reproduces the effects of many years of exposure to natural sunlight, but much faster. A glass item manufactured after this era will not turn purple with UV light exposure, so it is a true indicator of the items age.


As a courtesy we *ALWAYS* insure orders with a value of $50.00 or more, at our expense.

Thank you for visiting our offers shop!

You can click here to see the rest of my shop:

https://www.etsy.com/shop/MyHeirloomEssentials?ref=hdr_shop_menu

If you like Purple Vintage Glass, click here!

https://www.etsy.com/shop/MyHeirloomEssentials?section_id=18091247&ref=shopsection_leftnav_5

I also have a large collection of Vintage Quills & Bobbins here:

https://www.etsy.com/shop/MyHeirloomEssentials?section_id=18091243&ref=shopsection_leftnav_3

Check out all of my Heirloom & Retro jewelry here:

https://www.etsy.com/shop/MyHeirloomEssentials?section_id=18091239&ref=shopsection_leftnav_1

And please look at my Vintage Kitchen items here:

https://www.etsy.com/shop/MyHeirloomEssentials?section_id=18091237&ref=shopsection_leftnav_2

Our goal is for you to be happy with your purchase and with all your dealings with us. If you are unhappy with your purchase, please let us know prior to leaving feedback so that we can do our best to make it right.