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Hi Mark:

My two cents....which with five bucks, might buy you a cup of coffee at 
Starbucks!

I'm not sure if moving a tape from 60%RH to a bag, then sealed and 
stored at lower temps will cause actual dew formation but If the tape 
will be stored in "close to ideal" storage conditions after play-out, 
then in almost all situations, you're better to allow the tape to 
breathe. Do not wrap back in the protective bag then place into the 
cardboard tape box. Moisture + tape = sticky shed and or mold. The tapes 
may have come packaged new from the manufacturer that way back in the 
day, but it's not the ideal storage packaging for archival tape storage.

If the tape base is acetate based (you did not specify the tape base) 
than this is even more important as a micro-environment such as a bag 
holding higher than ideal RH, can promote vinegar syndrome. Keeping an 
acetate based tape in this micro-environment, allows the acetic acid 
vapor to build up and escalate the breakdown faster. I've seen this in 
many collections.

Obviously lower storage temps can slow mold and vinegar syndrome 
breakdown but why take the risk?

Some plastic based tape formulations are more prone to sticky shed than 
others (see references the like of Richard Hess's website, etc, etc). 
The higher the RH environment that the tape is stored in (for certain 
formulations and back-coatings), the better the chance for sticky shed 
problems and the longer the baking time associated for short-term 
correction of the problem, if another payback of the tape is required at 
a later date. Again another reason for abstaining from storing tapes in 
plastic bags.

Plastic wrapped tape reels were NIB packaging from the manufacturer and 
meant for short-term resale of the product. I do not believe that 
long-term archival storage conditions were taken into account or ever 
tested for this packaging. As long as your facility does not present a 
high liability of water damage from flooding or fire, if feel there is 
no need for plastic bag storage.

Kind Regards,

John Schroth

MTS

On 12/13/2017 12:06 AM, Mark Campbell wrote:
> I have a question regarding dew point and open reel tape playback and subsequent vault storage.
>
> It is a given that playback of tapes will occur in temperature and humidity conditions that are far from ideal for tape storage...(ideal being something approaching 16 deg C and 30% RH and a good studio for playback is set to be comfortable for humans not tapes  ---22 deg C and  60% RH)
>
> The problem thus arise:
>
> If after playback of a 10" master tape...I dutifully place in back in its plastic bag and then into its cardboard tape box ...in doing so...I have capture a bubble of air which surrounds the tape inside the bag which is at 'studio conditions" (60%RH)
>
> That tape (well bagged and boxed) goes to an hypothetical cold store at (8 degrees 30% RH)
>
> My question is...will the plastic bag hold that 'studio-air' around the tape...and cause dew formation?
>
> And if so...
>
> Would it be best not to use the plastic bag at all...and allow the tape to 'breath' in its cardboard tape box?
>
> I hope to hear from you soon.
>
> Mark Campbell
>
>
>
>
>
>
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