We just had a donation of a photograph that has mold growing from the outside of the framed print.  It looks as if it is a powdery mold, that brushes off easily.  However, it has penetrated the acid-free backer of the print and is even started clinging to the front of the print.  Does anyone have any suggestions for cleaning the print and framing materials, and preventing the return of the mold?  This is an historic photograph.
Thanks in advance,
Teresa Whitt, Director/Curator
South Charleston Museum

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