The higher the number the better fastness is obtained.
Artificial sunlight (solar simulators) are also used for sun light exposure testing and of "color fastness" and "material stability" for textile, plastics and paints.
Low wet fastness therefore normally not suited for apparel fabric.
The plant is rich in tannins and can be added to other dye baths to improve light fastness.
Here, in the fastness of the citadel, lived the emirs, their chief viziers, military leaders, and numerous servants.
Because the slowness or fastness are determined by the complexity of these musical manifestations.
Mordants increase the fastness of the dye since the larger molecule is now bonded to the fibre.
Accordingly, he retired into a mountain fastness and lived as a hermit.
