I've considered myself a student of glazes and glaze chemistry for 25 years. Of the library I've compiled on glazes this is, without question, the best book on the market. It is one of only two that I always refer to.It includes the scientific principles behind glaze composition, fit, stability, and the procedures for glaze testing. It's the only book I've found which goes into serious detail about what makes a glaze stable and safe, as well as how to test that a glaze is stable without your own lab.Never go any where without it.