http://www.oldcoinman.com/
Sito molto didattico con link sulle proprie aste (Yahoo, Ebay e Amazon),
sulla catalogazione delle monete attraverso la leggenda e su consigli per
la pulizia
http://www.ancient-times.com/info/cleaning.html
Explore the world of cleaning ancient bronze or silver coins. In each section
of cleaning techniques, I have listed a number of possibilities. With each
method I have also included a brief critique and whether or not I can recommend
it. You may want to try them all to find the one that is right for your
circumstance.