Anyone have any informed comment on the suitability of polystyrene in conjunction with B&W photographic materials? We have been advised, in our prep for moving the whole place, of a method using records center boxes and acid-free suspension folders, using the expanded polystyrene of the type sold at building supply stores for home insulation, as cushioning and dunnage. This method would also employ Foamcore in the bottom of the box. Sure, Ethafoam would be better: just as a two-week vacation in Vienna would be better that six months in Branson MO.