Acid test stone

[cti4sw]

Quick question - what is type of stone is used for acid testing? Slate?

 

Amazon Forum Fav 👍

A History of Mining on the Kenai Peninsula, Alaska - Grab it through Amazon!

[CincinnatiKid]

Any abrasive stone works. It's the residue of gold, silver ect., left on stone, that acids reveal. Peace

 

[cti4sw]

Cool. Gonna find myself a nice piece of 19th-century roofing slate. Thanks!