ISO 23169 is an international standard on field test methods for mass assessment of interior-wall coatings. The standard specifies methods for mass assessment of interior-wall coatings in the field to ensure mass and adaptability of coatings. The standard specifies experimental equipment, experimental procedures and data processing methods. Specifically, the standard requires visual inspection, color difference measurement, Glossiness measurement and stain resistance measurement of coatings under specific conditions to evaluate the Appearance, Color, Gloss and Durability of Coatings. The standard applies to a variety of interior-wall coatings, including wall finish coatings, wallpapers, and paints.