Digital BW, The Print

> 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?

Back in the days when I was a poor student, I sometimes used aluminum  
foil as a "barrier paper" between archival prints + mats and el cheapo  
backing board.  The print was "hung" on the back of the mat with linen  
tape, and a layer of aluminum foil separated this good stuff from the  
backing.  After thirty some years the prints still look fine.

Myron



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