vjodhani said:
Dont ever sell your materials on the basis of XRF. Always get your sampling done by ICP to get the best price for your precious metals.ICP is 99.9999% accurate.It is more accurate than the Argon gas spark technology using a 100W tube.XRF only uses a 10W tube with just 10 microns surface penetration and highly effected by the atmosphere.The jewellers keep this machine and loot people.LOL.
To keep you informed as per LBMA (london bullion markets association) guidelines; analysis via ICP can only produce certificates to sell silver and gold.
Read more here:-
https://goldrefiningforum.com/phpBB3/viewtopic.php?f=39&t=27634
Excuse me but that's incorrect, and not even based upon reason - merely emotion. There's no reason not to sell based on an XRF reason at all. Assuming everyone is a crook is not a valid argument, and in my experience, people that assume everyone else is a crook are usaully crooks themselves.