I have some odd-sized negs (and a few slides) for which I need to make up a mount before scanning. When I used to put in negs/slides for printing, they would sometimes come back with a taped card/paper edge - I presume that was used to mount them for printing (though the tape seemed very sticky, and some, when aged, cracked/tore). Is there any particular paper/card and tape used for that purpose that I can adapt for scanning.