Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Almost totally worthless...

This book is pretty much completely useless to anyone, unless you are firing a very controled kiln environment. Most of what the author talks about is either pointless or just common sense things that go unsaid which you already know.This book is an extremely bad buy. It lacks any practical value, and is way over priced. This book MIGHT be worthwhile if you can get it for less than $3.00... Even the quality of the book is extremely poor. It is much smaller and shorter than it appears and the actual paper the book is written on appears to have been xeroxed. VERY BAD BUY!! STAY AWAY!!!I am a fairly advanced potter and own my own gas fired kiln which I built myself from scratch. I know about kilns and kiln books and this is of very little value. If you want a good one try "The Kiln Book", it seems to be the best one out there.