The main aim of this book is to provide a concise guide to the penetrant inspection method of non-destructive testing. The emphasis is practical and is aimed at indicating how the various processes can be applied. The book begins with a survey of the history of the technology and the introduction of non-destructive testing. It goes on to discuss the penetrant process itself, its development, principles of the processes, techniques, choice of methods and the equipment that can be used. It also examines the quality control of penetrant materials and processes. The final chapters deal with health and safety and the management of penetrant waste.