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 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