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Blue Scales (Blue Wool Fade Cards)


These cards, which measure 5 x 1-1/2in., feature eight strips of wool cloth dyed in different degrees of color-fastness. They are used by conservators and curators to measure intensity of the illumination a display is exposed to and to alert them to reduce the level of lighting or rotate an exhibit. Ideally, one card should be kept in darkness and compared to a second card kept in the display case in order to measure the progression of light damage.






Item #



Blue Scales

$17.50 ea