Though the book is aimed primarily at those interested in so-called "dry" or matte glazes, it contains a wealth of information on glaze components and how they interact with each other to form a hard colored coating on clay. The first half of the book discusses more general topics such as what makes glazes matte versus glassy; how glazes are applied; the safety considerations involved in the mixing, applying and firing of glazes; and the differences between a glaze, an engobe and a slip. The rest of the book is separated into chapters based on the base element used in the glazes they discuss (for example, sodium, potassium, boron, calcium, barium, and many more). These latter chapters are more technical in nature and much of the information is beyond my ken at present. Nevertheless, they do provide a good overview of the different possible glaze elements; their effects on glazes; and their interactions with different metallic coloring oxides.
So, if matte glazes are of interest to you, then this book is a required purchase. If, like me, you just want to increase your knowledge of glazes in general, then this book is also quite valuable. If nothing else, the book is filled with photographs of luscious ceramic works by a variety of artists, and includes the recipes they used to produce the amazing finishes on those works as well as pages of photographs of test tiles fired using those recipes.