I am glad! This book is easy to read, understand, and apply! It contains everything you need and more! There are hints, points on the reflex to adopt the compositions and to their areas of application and comprehensive income for mixtures; and for each topic !! I have tested several and really it works! It employs a style of writing that makes reading enjoyable and funny sometimes. For me it is a purchase well placed and profitable by its effectiveness. 5 stars without hesitation !!!