Well, I believe it's time to cause some controversies! I bought this book while I was at the second semester of the 2015 Summer Seminar. It was presented during the course on "Detection of Counterfeit and Altered Coins". I was lucky enough to have it autographed by Bill Campbell, past president of the ANA and Brian Silliman, another of the instructors. This book tells some of the procedures that "coin doctors" produce and alter coins. It's not a recipe book but it's pretty close. Everyone should read this. Without going into to much detail, it will show you that just because a coin is in a slab, that doesn't make it genuine. Shocking news, no? Here is an exert from Amazon: