Brown glass and WWII

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From Wikipedia's article on glass color:

  • Green glass of the sort used in bottles is produced by adding iron(II) oxide to glass.
  • Brown (technically, amber) glass is produced by adding sulfur, carbon, and iron salts to glass.

Sulfur is a critical industrial and military substance, and as such, "frivolous" uses such as coloring beer bottles would have been restricted during World War II. Iron(II) oxide, on the other hand, has few uses other than as a pigment. Sure, you can smelt it to produce steel, but the steel industry mostly used hematite and magnetite.

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