Cleaning and Preservation of Coins and Medals by Gerhard Welter
Cleaning and Preservation of Coins and Medals by Gerhard Welter.
This book offers enrichment on the subject of coin cleaning, and contains sections on plating, lacquering, paper money restoration preservation- and more.
This is a book that offers enrichment on the subject for collectors who already have a solid grasp of coin cleaning. It is written by a German for a European audience, where the age of coins can date to the Middle Ages, the Roman Empire or the time of Alexander the Great. However, there is clearly a market for this knowledge here as the book is in its tenth New York printing in the last 35 years. To clean silver, for example, references include dipping coins in citric acid, vinegar, hydrochloric acid, ammonia, diluted sulfuric acid and alcohol. Electrolysis and ultrasound treatments are discussed. The best utensils are described for removing dirt, corrosion and other unwanted accretions (heard of a glass brush?). Methods are also presented for restoring tarnish to coins that have been too brightly cleaned. There are also sections on plating and lacquering. If you want to know as much as possible about coin cleaning and preservation, this book should probably be in your library.
As a bonus, there is a section at the end, by J.J. Curto, on paper money restoration and preservation, presented in a basic way for a broad audience. To remove pencil marks, tape, oil or dirt from a bill, solutions are presented. If you want to know the best way to flatten creases in a banknote, the answers are here.
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