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Yellow glass was used in automobile, train, and nautical signal lights. When found as sea glass, these yellow pieces often have a telltale ridged or bumpy pattern, which gives a clue about their original use.
“Bright yellow ambers were popular for bottles of bitters, but they were also used for remedies (real or fake),” says Paula Newman from Peblsrock in Seaham, England. “Bright yellow became popular for seltzers and some other drinks, as it wasn’t a ‘danger’ color and so wasn’t used for poisons. If the bottle was squat or unusually shaped, it’s likely to have been