Instruct: Classify the given review into positive or negative sentiment.
Query: Step-by-step photos cover these techniques in depth

The craft, art and restoration techniques for stained glass are explained in Pere Valldeperez's Stained Glass, a practical, "user friendly" guide which goes beyond competitors which merely display stained glass. Step-by-step photos cover these techniques in depth and detail: art students working in the medium will find this an essential coverage.