The colors are all fade resistant. For those of you who are more concerned about conservation yet need more colors than are available in the museum boards, these are a good choice. They are completely acid-free. These are also buffered with calcium carbonate. This helps to reduce the acidity that can migrate from other components of the artwork package.
All colors are fade resistant, although color selection is limited.
It is considered the best protection you can put on your artwork and are the only boards used by museums and fine art galleries. Artwork is always hinged to a backing board and not to the back of the mat. The backing board should be of acid-free material and of sufficient rigidity to support the art without buckling. It acts as a barrier from contamination from any filler board, and creates a surface from which to hinge the artwork. The backing board is then taped to the window mat.