Oil Lamp, Amethyst, Purple, sold irradiated, late 1800's, with oil guard, Embossed Patented, Glass Finger Lamp, FREE SHIPPING

This listing is for a beautiful Amethyst purple antique pressed glass oil lamp with finger grip handle.

It is 6" tall to top of brass ring and 3.5" across the base.

The lamp comes with an oil guard. (Elevated rim).

Bottom is embossed:
PATD SEP 20 1870 OIL GUARD LAMP

It is in great working condition with no chips or damage. It does have seams visible from manufacturing.

This lamp does not come with a chimney or burner but they are readily available at any good antique mall.

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 sold 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.

FREE SHIPPING

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