TiO2 has been widely applied as white artistic pigment since 19th century. And the photo-catalytic effect of TiO2 makes it aggressive and causes degradation on painting surface. The damage of binder by TiO2, also known as chalking, has been suggested as the main cause of the painting surface degradation and studied a lot. However, the danger to pigments used with TiO2 together, especially the organic ones, is rarely noticed. In this study, artistic TiO2 and industrial TiO2 were studied: a Titanium white pigment from Kremer, industrial catalyst from Hombikat and Hombikat coated with Al2O3 in an atomic layer deposition process. The titanium dioxides were mixed with five colorant pigments and linseed oil into paints. After drying, the paint films were illuminated under artificial light to reveal the surface change caused by TiO2. After artificial light aging, the color, gloss and roughness of all films have changed. As expected, Hombikat TiO2 is proved to induce most changes. The Hombikat TiO2 degrades the binder and the colorant pigments in combination with light. The coating of Hombikat with Al2O3 shows little effectiveness in preventing the degradation. The Kremer TiO2 mainly degrades the binder to cause surface change. The degradation of the binder contributes to the roughness increase mostly. The color of Green earth is not affected by any of the three titanium dioxides. Vermilion’s blackening phenomenon is largely boosted by TiO2. Prussian blue degrades faster than others. And the organic Indigo and Hansa yellow most likely to have broken molecular bondings caused by TiO2.