I just received my copy a couple of days ago. I haven't quite finished reading it through thoroughly yet; it's only a small book (90 pages) but it's got good information and it's not so technical that a non-chemist can't follow what it says.
Most of the chemistry under discussion is about toning of silver coins. If you like toned coins and think nothing of paying multiples of the book value for a nicely coloured coin, reading this book will probably be a world-changer for you.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis