tin in aqua regia

[sayf]

supposing that tin is introduced in aqua regia
can u give answers for the following questions please
1-what gonna happen to gold if its compined with tin?
2-if some chemical reaction happens between tin and gold and colloidal gold is formed, will i be able to precipitate this colloidal gold by smb or zinc or iron sulphate or any other material?
3-if colloidal gold can be precipitated what will be its color?
4-if colloidal gold cant be precipitated then how to break the colloids and make it precipitate?
5-if colloidal gold can be precipitated then how to get my gold from that precipitant?
Sorry for the too much questions but am trying to learn
Thank u

 

[Lino1406]

Coloidal gold can be blue, red... breaking - by acid. Precipitate - brown, but amount negligible

 

[g_axelsson]

Add a bit more nitric. The tin will form metastannic acid and the gold goes back into solution. It can take a long time to filter but it can be done. Precipitate as normal.

Göran