This article is intended to provide significant improvements to the existing ISO standardized test method for evaluating the flood resistance of digital prints. The current method, 18935–2005 Imaging materials: Colour images on paper prints: Determination of indoor water resistance of printed colour images, is useful for the evaluation of consumer products but is inadequate for the needs of cultural heritage institutions and the preservation of their collections. These collections contain both pictorial images and documents that are saved for their information content or aesthetic value (or both). Several digital print types were tested with variation in soak time, measurement types, and assessment criteria. The final result of this project is a new test method with expanded evaluation criteria.