I'm having some metal prints made up and possible acrylic. So my question is what is the best way to sign this type of printing? I'm wondering if my best bet is to digitally add my signature to the image file prior to printing? Now I have looked into archival pens for metal prints that are recommend by my printer but I don't think this will go over well with acrylic. Thanks for the info. FYI: Metal prints = Aluminum and not paper.