ISO 18935:2005 specifies tests to determine the relative indoor water resistance of printed colour images. ISO 18935:2005 is applicable to both digital and analogue prints.
BS ISO 18935:2006 history
2018BS ISO 18935:2018 Imaging materials. Colour images. Determination of water resistance of printed colour images
2016BS ISO 18935:2016 Imaging materials. Colour images. Determination of water resistance of printed colour images
2006BS ISO 18935:2006 Imaging materials - Colour images on paper prints - Determination of indoor water resistance of printed colour images