Conservation of books and paper involves preserving and stabilizing the material as it is while retaining as much of the original materials as possible.[5] Conservation differs from restoration which involves returning a book or manuscript to new condition with the use of more invasive techniques and less preservation of original materials.[5] Preservation is an umbrella term which encompasses conservation and restoration; however, the terms are sometimes used incorrectly when referring to library and archive conservation.[6] The main goal of modern conservation is to maintain the integrity of the original parts of the object and that any additions due to restoration must be reversible.[7] There are two approaches of conservation: active or interventive conservation and passive or preventive conservation.[8] Active conservation involves evaluating the condition of an object and treating to prevent further decay by cleaning, repairing, and restoring when necessary.