Color of paper and board

Are there color standards for art boards and papers, or does each
manufacture establish their own?  What I am looking for is whether
white, off-white, etc. are relative terms or are derived from some
set standard. Placing art papers under ultraviolet lights shows that
manufactures are using various brighteners to get what to the human
eye looks "white", but when they are photographed it become obvious
they are not (usually they are blue-white).

Frank A. Reynolds
Hunt Institute

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                  Conservation DistList Instance 12:44
                Distributed: Tuesday, November 17, 1998
                       Message Id: cdl-12-44-015
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