The Secrets of Gold and Silver Scrap

This book written by United States precious metals refiner Chris Owen (aka goldsilverpro, his username in the Goldrefiningforum.com) has an enormous quantity of knowledge in the field of precious metals refining, particularly gold and silver refining. From all sorts of gold and silver scrap, buying and testing, chemistry methods and procedures (mainly inorganic and analytical chemistry) to the selling part. It is certainly a book you have to read if you want to start a refining business or a new hobby.