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In page Borax:
"A mixture of borax and ammonium chloride is used as a flux when welding iron and steel. It lowers the melting point of the unwanted iron oxide (scale), allowing it to run off. Borax is also mixed with water as a flux when soldering jewelry metals such as gold or silver, where it allows the molten solder to wet the metal and flow evenly into the joint.[citation needed] Borax is also a good flux for "pre-tinning" tungsten with zinc, making the tungsten soft-solderable.[9] Borax is often used as a flux for forge welding.[10]
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