Physicists unveil the sharpest paper, surprise ahead

Paper cuts are more than just a simple annoyance. What type of paper is the sharpest? A recent Danish study reveals the unexpected culprits.

Three physicists from the Technical University of Denmark examined the cutting ability of different types of paper using ballistic gelatin, which simulates human skin.


Unlike previous studies focused on infections, this research concentrates on the physical properties of paper to reduce the risk of injury.

Their work highlighted that the likelihood of a cut varies with the thickness and strength of the paper. Very thin papers fold easily, while thicker ones do not penetrate the skin due to their wide surface. It is the intermediate-thickness papers, like those from newspapers or dot matrix printers, that are most dangerous.

Other frequently implicated types of paper include Post-it notes, printed magazines, and office paper. Conversely, tissue papers and photo papers are considered less cutting, unless they're handled at a certain angle, increasing the risk of a cut.

To demonstrate the formidable cutting efficiency of certain papers, the researchers attached a dot matrix printer sheet to a scalpel, creating a "paper machete." This improvised tool was able to slice through vegetable skins and even meat, highlighting the unexpected sharpness of some papers.

This study, published in Physical Review E, opens up new perspectives on cut prevention, a subject largely overlooked until now. Thanks to these findings, it may be possible to avoid these small, unpleasant injuries by wisely choosing the type of paper used daily.

To learn more: why are paper cuts so painful?

Paper cuts, although small, cause disproportionate pain. This can be explained by the high density of nerve endings located in the fingers. A paper cut, tearing the superficial skin without causing deep wounds, stimulates a large number of these nerves.

In addition, the edges of paper are irregular and create an uneven cut, increasing tissue irritation. The paper edges can also deposit tiny particles in the wound, which exacerbates discomfort and prolongs pain, especially due to the shallow depth of the injury.

Finally, the location of cuts, often on the fingers, makes healing more difficult. Fingers are constantly in motion and in contact with various objects, slowing healing and keeping the pain active for longer.