The Inquartation method is one of the most common methods of refining low and medium karat gold jewelry (9K-18K) and can also serve the...

4 - Gold precipitation with Sodium Metabisulfite. Now that we have our Gold solution (Chloroauric acid - HAuCl4) filtered and clean of...

Before we start, you should know that there is some dispute regarding a direct Aqua Regia (AR) refining process for high gold content...