Fade Indicator cards
Blue Wool Fade Cards
Test for effects of light on paintings, documents, and textiles with Blue Wool Fade Cards. Each card features pieces of wool cloth dyed with blue dyes of different degrees of fastness which are used as lightfastness standards. They allow you to monitor the net exposure to light given to objects on display, and to alert conservators to adjust intensity of illumination. Each card measures 1-3/4" x 3" and are sold by the each.
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