[font color=\'#000000\']I sign on the front of the image in the white border and on the matte. If someone wants to reframe it they still have a signed print.
This way when I become the Ansel Adams of the 1Ds their art will retain it's value;-)[/font]
[font color=\'#000000\']I do as Jack. I sign in the margin and on the mat. I use fine art papers, so I sell matted prints. The coating is too fragile to put them in tubes. I have to print them from the back of the printer on a flat path.
I also provide the buyer with a lifetime replacement guarantee against fading.
Also, I give them two signed and numbered certificates. One is attached to the back of the foam core board. The other is loose, so they can attach it to the back of their framing packet.
My grandfather told me to always give the customer a little more than they expect.