Chemistry of Metal Testing

[MacDaddy]

Here are some excellent links to metal testing techniques and the chemistry involved.

Testing Precious Metals and Alloys

White Metals and Alloys Testing

http://www.delostooleauthor.com/gold_platinum.html
Unable to provide active link, so copy and paste to browser address line.

 

[AgAuPtRh]

cool stuff there MacDaddy

Thanks.

 

[MacDaddy]

I think I copied this from a posting on the Ganoskin site as well. Always wanted to know this...

Gold Testing Solutions-
concentration for 333 kt gold: 2 parts nitric acid to 3 parts water
(distilled water)

concentration for 585 kt gold: pure concentrated nitric acid.

concentration for 750 kt gold: add a little amount of hydrochloric
acid to the concentrated nitric acid.

concentration for silver: 1 part of nitric acid to 3 parts of
hydrochloric acid (agua regia). This solution creates a white
deposite of silverchloride which turn into a dark violet color
depending on the amount of silver in your metalstrike used by a
touchstone procedure.If the metal doesn't contain any silver,the
metalstrike stay's gray or disapears after a while.

 

[jimdoc]

Didn't know where I should post this, but this looked like a good spot.
Purple gold on Ebay;

http://cgi.ebay.com/Purple-Gold-5g-ampoule_W0QQitemZ160107644401QQihZ006QQcategoryZ413QQrdZ1QQcmdZViewItem

It says it is 79% gold and 21% aluminum.