Well, for me, this book has shared a lot of useful information and tips on how to come up with ones own crystalline base glaze. Then, it explains how to achieve different crystal/background colors by experimenting with different oxides, along with nice, consistent firing schedules that I have tried and have gotten great results from. One must understand that a glaze recipe might be good in one area, but does not always work out in another area. So far, my results are pretty on point with what is shown in the book, and I found that really astounding. I give this book 5/5, and having it is a must whether your a rookie or experienced with crystalline glazes.