[marika]

once these metals are disolved in aqua regia, how do i get the various metals back?

[Borek]

They were dissolved by oxidation, they can be precipitated by reduction.

[marika]

Ok. All I know about chemistry is what I have read about the subject. I need to have a more specific answer. thank you.

[Borek]

That will require more specific question, as there are many possible ways of dealing with the problem. Adding almost any reducing agent to the solution should preciptate noble metals.

[marika]

 :)ok. lets say i want to get the platinum out of the mixture. how do i do that.

and the silver. i have heard that the liquid should be dried out over low heat, then the silver forms a "crystal"? is that so?

thank you very much 

[marc]

Are you actually doing this?

[kore]

As far as Gold....

Once you have used the aqua regia on the gold and the process is complete.

The excess nitric acid must be neutralized with urea to  PH 1 +/- 0.4 then drop the gold with SMB.

* SMB - Sodium Meta Bisulfite plus water = 28.3 grams sodium meta bisulfite, 240 ml H20.

William