The tissue wipe should only be done AFTER the mold has been driven into
dormancy or you may simply smear the mold over the surface of the tape.
Sufficient "baking" time could drive the mold into dormancy by removing
residual moisture from the tape and mold but, baking at 40C, will not kill a
lot of molds. Also, if the mold is severe or has seriously compromised the
tape edges, baking can harden the residue, making it harder to remove and,
potentially, "welding" tape edges together between wraps.
Baking could work but it could also cause additional problems. We have done
extensive testing and mold removal and have found that the process or
driving the mold into dormancy using low humidity chambers is the most
effective and safest method.
SPECS BROS., LLC
Celebrating 20 Years of Restoration and Disaster Recovery Service
> -----Original Message-----
> From: Association for Recorded Sound Discussion List
> [mailto:[log in to unmask]]On Behalf Of Prentice, Will
> Sent: Wednesday, July 23, 2003 5:29 AM
> To: [log in to unmask]
> Subject: Re: [ARSCLIST] Advice on restoring a 1954 audiotape
> Peter Brothers wrote:
> You can do a rough test for binder instability during early stages of the
> tissue wipe. If you get a "waxy" residue or little "flakes" of tape come
> off on the tissues, you have a binder instability problem that may need to
> be addressed before continuing with the tissue wipe.
> ----In the event of discovering a tape with both mould and sticky binder,
> what effect would baking (to harden the binder) have on the
> mould? If, say,
> baking at 40C (94F) for 8 hours, would it be killed, driven into
> dormancy or
> somehow made worse?