I have been making CS for a few years and I'm now interested in making colloidal gold. But a search of the archives and extensive googling shows that gold generators are few and far between -- and expensive. One of the less expensive, which is said to produce both silver and gold is on sale at http://colloidalsilvergens.com/generator-info/colloidal_gold_generator. htm
The sales report says it can produce "40ppm and higher with a new 4" electrode which is 90% .999 gold and 10% .999 silver." Has anyone had experience with this machine? Comments would be appreciated. George