Book excerpt: Stained glass is one of the most compelling forms of church decoration, and yet it is also one of the most vulnerable and least understood. This handbook is for those entrusted with the care of stained glass windows. It provides guidance on the causes of deterioration of stained glass as well as advice on managing the conservation and future care of church windows. The book features a list of useful addresses and websites, and also contains guidelines on the photography of stained glass.