[MassHistPres] mildew/mold in antique home

[Linda Miner]

Can anyone offer some info on 1) identification of mildew/mold in an 1820s attic, and 2) proper remediation and insulation?  The house has been vacant for about 6 years.  Other than the attic, and being closed up through 6 winters and summers, the structure itself is in good shape.   The property is located on the Cape.  Any thoughts/ resources would be appreciated.  I've read many warnings of spray foam insulation which has been widely suggested as part of the solution, but it seems counterintuitive to restoring an antique home.  Thanks, Linda.