Wohlwill process Wohlwill process The Wohlwill process is an industrial-scale chemical procedure used to refine gold to the highest degree of purity (99.999%). The process was invented in 1874 by Emil Wohlwill. This electrochemical process involves using a cast gold ingot, often called a Doré bar, of 95%+ gold to serve as an anode. Lower percentages of gold in the anode will interfere with the reaction, especially when the contaminating metal is silver or one of the platinum group elements. The cathode(s) for this reaction are small sheets of pure (24k) gold sheeting or stainless steel. Current is applied to the system,
The Essence of Black Purity The Essence of Black Purity The Essence of Black Purity is the third release by the black metal band Watain. It was released in 1999 on EP format on Grim Rune Records and was limited to 300 copies. Grim Rune website mentions that the EP "got a generally good response in the underground circuits." Similarly, Eduardo Rivadavia of "Allmusic" wrote that Watain "quickly gain[ed] underground credibility" with this "uncompromising 7" release". When asked his opinion about Watain's older albums, vocalist Erik Danielsson said: "I appreciate them for what they are, monuments of what we were before, pieces of evolution. The