[WildHorseCrash]

I think in speaking of white gold, you are talking about what is done with it to give it strength in use as jewelry etc.
Adding nickel is obviously NOT part of any purification process. Purifying Gold removes what is not gold - it does not include adding things to the gold, that is counter to the concept. IE, you don't seem to be paying attention, are misguided in your response or are being misleading.

Oh, I see, so when you said that "white gold is actually purer than yellow gold" you weren't talking about actual white gold (which is yellow gold mixed with silver or nickel and therefore not "actually purer than yellow gold"), you were talking about "white" gold--that fantastical creation of your imagination. Too bad you chose a name for this mystery metal that was already in use.

[Havoc]

Has nothing to do with the name, it has to do with paying attention. Purification obviously has nothing to do whatever with adding non-gold to gold, it is the exact opposite of that. That should have been your first clue.