Measuring fading of light-sensitive pigments

Rob Lewis <rob.lewis0 [at] talk21__com> writes

>... We would be interested in
>hearing from anyone who has used a spectrophotometer for this
>purpose, and particularly if and how they have determined the limits
>of "acceptability", when using for example, and Delta E* as a
>measure of difference between CIE L*a*b* values.

We had promising results with a low-cost, hand-held
spectrophotometer back in 1999 at the Gardner Museum in Boston.  You
might find something interesting in:

    Mangum, B.J., and A. Heginbotham
    Use of the X-rite Colortron for Color Measurement of
    Watercolors. in Stratis and Salvesen eds., The Broad Spectrum:
    Studies in the Materials, Techniques, and Conservation of Color
    on Paper. London: Archetype Publications, 2002


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                  Conservation DistList Instance 19:30
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