If the tape is patterned, look for the flaw or break in the continuous pattern. On a roll of zebra-print duct tape, for instance, look carefully for a point where the stripes do not entirely match up.
If you have very short fingernails, try running the edge of a knife around the rim of the roll. [1] X Research source You might also use a toothpick, a paperclip, a key – anything that allows you the sensation and precision to feel a slight ridge in the surface of the tape. Be careful not to press too hard and puncture the tape. [2] X Research source If you don’t feel anything on the first pass, try going around in the opposite direction.
If you don’t want to use your finger, you can also dip the roll of tape directly into the flour or chalk dust. Be sure to immerse it thoroughly. There is a chance that the flour will stick to the edge of the roll, revealing your goal!
In theory, you can use almost anything to mark the end of the roll: paper, a paperclip, a twig, a card. Use anything that isn’t too bulky and sticks cleanly to the edge of the tape. Improvise a solution using the materials you have lying around your home or office.
Consider buying a “tape gun” for packing tape. This device is a convenient, handheld version of the standard tape dispenser. Run the tape gun along the surface of a box, and you will seal the box without losing the edge of the roll. You can find tape dispensers online or at office-supply stores. Be aware that many standard tape dispensers are designed for use with Scotch tape
