Originally Posted by Little RoO
I ended up buying some Artist Mounting board (the stuff that boarders a picture in a frame). ......as the cardboard is used for paintings I thought it must be fairly safe........someone please tell me if it's not !
Matboard can be archival or not and, of course, it's not marked. You have to ask if it's archival (or conservation or museum grade) when you buy it and it will cost much more than regular. Regular is made from wood pulp and goes for around $6 for a 32x40 sheet (half that for thinner sheets). Archival is made from cotton and is close to $14 per sheet. (Foamcore also comes both archival and non-archival)