Some interesting facts about sea glass:
Sea glass with pale amethyst or light purple hue is more than 100 years old.
It’s known that from the late 19th Century to the 1910s manganese dioxide was commonly used as clarify¬ing agent (to make glass clear). It was later observed that glass containing manganese began to change from clear to an amethyst color when exposed to the UV light from the sun.
Early in the 20th Century other compounds gained popularity as clarifying agents as they were more effective in the mass-produced bottle making process.
So, pale amethyst or light purple sea glass can be dated back to at least the beginning of 20th century.
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