Again and again I am confronted with the question why I deliver my photographs with borders.
There are several very good reasons for this. I will describe them here.
The main reason is that this edge is to grab the prints without touching the motif. Some of the papers I use are very sensitive to sweat residue. In any case, the pigments can be damaged in the long term by the grease/acid mixture of the skin. These residues can hardly be avoided when touching, so I recommend using cotton gloves whenever possible.
When archiving photographs, impact damage to the edges is almost inevitable in the long term. The white border protects the actual motif from damage even in this case.
If you are presenting your photographs mounted in a passepartout, the print must be glued in the back of the Passepartout. This means that the viewing window must always be smaller than the print used. If your picture has a white border, you can lay out the passe-partout exactly to the size of the motif and use the white border for fixing behind the cardboard . In this case, nothing of your motif falls away.
I often use the white border as a “mock passe-partout”. This has the advantage that I can adapt the outer dimension of the paper sheet to a standardized frame format without having to trim the motif. All I have to do is adjust the white border accordingly.