[Nhcoll-l] Blue Matrices

[Katie McEvoy]

Recently the museum I work at received a donation of fossils with matrices
that have turned blue . The donor has said that they were stored in a dark,
dry basement in paper towel/plain newsprint and were not treated with
anything. Some of it looks like accretion while some of it appears to be
the matrix itself and they do not fluoresce under short or long wave UV
light.

Has anyone seen this before or know what may have caused it?

Pictures attached.
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