2064

Antique Sun Purpled Oil Lamp

Currency:USD Category:Collectibles Start Price:25.00 USD Estimated At:50.00 - 100.00 USD
Antique Sun Purpled Oil Lamp
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Antique Sun Purpled Oil Lamp. 11.5''H x 5.5'' diameter. Missing chimney and rusty wick area. Historically it was noticed that this glass made without lead but containing manganese was found to turn a very light lavender if placed in a sunny window or otherwise exposed over time to (ultraviolet) rays of the sun. At some unknown point, antique dealers set glass out and if it turned purple, it proved to them and to their customers that the glass was made prior to ca. 1915 when most, but not all, glass companies ceased using manganese and substituted selenium as the clearing agent.