This book is written by a professional book writer, not a tanner. He seems to be getting most of his information from hide tanning kits and some tanning he has done himself. Since the book has no bibliography or footnotes, it is hard to say where he gets his information. He does refer to a Bruce Rittel of 'Rittel's Chrome Tan Products' a few times, as if having consulted with him.. He doesn't appear to have worked with or interviewed any professional or advanced amateur tanner..