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We are currently trying to remove only iron,zinc and indium in the alloy gold in the melting stage itself , other than copper and silver with gold. The reason for this trials is direct usage of the resulted alloy gold to the further process by adding required alloys to the required karatages.
We are currently using soda ash, potassium nitrate with oxygen blowing.
Is the above said fluxes are ok for use or can we try any other fluxes with different ratios.