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Does anyone know how this happened? Or a chemical that may get rid of it?

Can't do that as it all has very fine texture. They were castings

Please help. My assistant soldered her first batch of 9ct yellow gold and it has all turned pink. I have not seen this before.
Tried pickling (for a day!)
Tried hydrogen peroxide in pickle as I...

Thank you both.

Hope someone has the answer to this. Why does rose gold turn yellow? A customer has returned a rose gold ring I made last year as it is turning a yellow colour? Any ideas?