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As long as humans have been forming gold into precious objects, goldsmiths have struggled to offset the metal’s softness. Traditionally, this issue has been addressed by alloying gold with other metals like silver, copper, and palladium (the percentages of which yield the familiar karat system for grading gold purity). However, ...

As long as humans have been forming gold into precious objects, goldsmiths have struggled to offset the metal’s softness. Traditionally, this issue has been addressed by alloying gold with other metals like silver, copper, and palladium (the percentages of which yield the familiar karat system for grading gold purity).