[1] The electrolyte for this process is a mixture of lead fluorosilicate ("PbSiF6") and hexafluorosilicic acid (H2SiF6) operating at 45 °C (113 °F).
Impurities that are more noble than lead, such as silver, gold, and bismuth, flake from the anode as it dissolves and settle to the bottom of the vessel as "anode mud."
Because of its high cost, electrolysis is used only when very pure lead is needed.
[2][3][4] The process is named for its inventor Anson Gardner Betts who filed several patents for this method starting in 1901.
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