This paper presents how inkjet colour is affected firstly by the substrate and secondly what happens to ink on paper during exposure to indoor light conditions and air pollutants. The research uses both pigmented and dye based inks printed onto coated and uncoated fine art papers, and are subjected to light conditions that are constantly changing throughout the day and consequently the year. Although benchmark conditions and standards as issued by Wilhelm Imaging Research are useful, once a printed artwork enters the public domain artworks may be subjected to conditions beyond expectations of the laboratory, such as changes in light, humidity and pollutants. Colour patches were printed onto a variety of artist's coated and uncoated papers, which are then measured and photographed. The microphotography shows how ink sits within the fibres of the paper, and how colour and colour combinations changes over time. The paper does not make approximations on the life expectancy of a print.