Mat boards in your frames not only add beauty to your frame designs, but they also protects the artwork from getting stuck on the glass, by creating space between the art and the glazing.
When the preservation of your item is important, Conservation Mat Board is the way to go. Unlike regular mat-board, Conservation Mat Board will not bleed and cause contamination of your artwork, over time.
If you notice color transfer on your framed images, get them re-matted as soon as possible.
Changing your mats from time to time is also a cost effective way of renewing your artwork.