The act or process of mixing metals to make an alloy; the proportion of metal that is not pure in an alloy.
From 'alloy' (from Old French 'aloi,' possibly from Latin 'ad' and 'ligo' meaning 'to bind together') plus the suffix '-age,' which indicates a process, collection, or state. The '-age' suffix comes from French and Latin.
'Alloyage' is a delightfully archaic word that appears in medieval metallurgy texts and old assay manuals—it represents a time when discussing metal purity and mixing was so important to commerce that it had its own formal terminology that's almost completely abandoned today.
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