The action of flowing or melting; the process of treating with flux to promote flowing and fusion of metals.
From 'flux' (verb) + present participle suffix '-ing'. Essential terminology in metallurgy, soldering, and metalworking trades since the Middle Ages.
Medieval blacksmiths discovered that 'fluxing' iron with certain crushed minerals let them join metals together—a technique that made weapons, tools, and eventually modern civilization possible.
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