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What solder should I use when soldering 9ct Yellow to Silver, and what flux should I use?

When soldering 9ct to silver you can use either silver or 9ct solder. However if the item is to be hallmarked you must bare in mind the solder must be of hallmarkable quality, and the item will be assayed as the metal with the lowest hallmark, in this instance silver.

Borax (998 098) or Auflux (998 108) are ideal fluxes for this process.