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A gold refining process using Butyl Diglyme, is suitable for both large and small gold operations. High cost gold refining equipment is not necessary to extract gold, or refine gold using butyl diglyme. Extracting and separating gold in an inexpensive glass separatory funnel is one option. Gold purification of 99.9% is obtainable from this gold refining, purification process.
Before cadmium technology Gold Smith are using powder flex to soldering the ornament and the powder flex wax will remain with gold weight. Hope you understand now with nannees Coolmeerawahab. 916 means How much of purity in your gold thats says in % . For an example. The pure gold is 24 carrot. We can't make any ornaments with pure gold. So the gold Smith add some percentage of copper to make ornaments. While you add copper the gold purity will be come less carrot. While we purchase 22 carrot gold ornaments that mean 22 carroty divide by 24 carrot the answer will be comes .916.