Ideally, all photographic prints should be stored horizontally, although prints under 11"x14" and on stable mounts can be safely stored vertically. Prints should also be stored away from light and water sources in acid-free, lignin-free boxes manufactured using International Organization for Standardization (ISO) Standards 14523 and 10214. Storage materials should also pass the American National Standards Institute (ANSI) Photographic Activity Test (PAT), or similar standards, to ensure archival quality. If a photograph exhibits flaking or chipping emulsion it should not be stored in a plastic enclosure as static electricity could further damage the image. Clean cotton gloves should be worn when handling photographs to prevent skin oils and salts from damaging the surfaces.