Always keep the artwork well supported.
When storing artwork do not keep it rolled. Always store flat in acid free packaging such as acid free tissue or glacime and sheets of board, which is larger than the artwork to protect the edges. Tape the boards together tightly to prevent movement and place buffers made of corrugated card or similar over the corners, wrapping and clearly labelling.
When handling artwork wear cotton white gloves as this will protect the artwork from finger prints, be particularly careful with photographs. Work may look clean to the naked eye but problems caused by grease will show up later.