Digital BW, The Print

Hi,
I've just bought some Tyvek to place between prints and non-archival backing board.

Tyvek is breathable but waterproof - but if frames are not going to get damp from very high humidity, what chance is there of acids migrating, if something cheaper like alpha cellulose card is placed between the backing board and print?

thanks,
Richard
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http://www.richardsmallfield.com