To safeguard fragments of broken glass plate negatives, the shards should be kept in a special, custom-made, sink mat housing. The goal of these sink mats is to store the broken glass horizontally, with all the fragments in the same housing, while keeping them out of direct contact with one another. Future repairs, therefore, are less difficult because the edges of the shards are not allowed to abrade against one another. The flip- open front border and the additional plastic support allows on to remove and examine the glass plates with minimal manipulation.