My sister was given a bag of items including thread and crochet stuff. In the bag was this roll of some sort of tape. It is shiny on both sides giving the impression that it may be to iron one item to another. It 3 3/4 inches wide, and as you can see there is a lot of it. She would like to use it but does not know what it is for. There are no numbers or markings of any kind on the tube.
Do you have any ideas?