Hall Process Production and Commercialization of Aluminum - National Historic Chemical Landmark - American Chemical Society
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American Chemical Society: Chemistry for Life.
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The original was posted on /r/todayilearned by /u/MrMojoFomo on 2025-06-18 20:01:54+00:00.

Original Title: TIL that the Washington Monument is topped with an aluminum cap. When it was installed (1884), it cost roughly the same per ounce as silver and was considered a precious metal. Within 2 years, a new refining process developed that dropped the metal’s price from $4.86/lb in 1886 to $0.78/lb in 1893