Tecnología (Oropel)
El congreso estadounidense buscaba un metal dorado para emitir el nuevo dolar Sacagawea, más los científicos no daban con uno que aceptara las máquinas expendedoras, casi se habían dado por vencido, cuando decidieron probar con una aleación cobre-manganeso, que al combinarse con zinc pierde su tonalidad rosada y adquiere un color dorado, las máquinas expendedoras lo recibieron de buen agrado y también el capitolio.
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