Why fresh newsprint leaves a mark
Newspaper ink is designed for speed and cost, not to dry like the ink in a glossy magazine. In many conventional inks, pigments—the tiny particles that provide color—are carried in petroleum-based oils. When a newspaper rolls off the press, some of that oily carrier sinks into the paper, but the ink may not be fully set.
Newsprint is thin, porous, and uncoated, so it absorbs ink rather than sealing it beneath a smooth surface. That helps newspapers print quickly on inexpensive paper, but it also leaves pigment near the surface where a finger can pick it up.
The tradeoff at the press
Newspapers are printed in long, fast runs. The ink must flow easily through the press and transfer cleanly onto paper moving at high speed. Formulating it to dry instantly could make it harder to spread or transfer reliably, while using paper with a barrier coating would add cost and change the familiar feel of newsprint.
As the paper sits, the ink’s oily components continue to soak in or otherwise set. Until that happens, pressure and friction—turning a page, gripping a headline, or rubbing a margin—can move pigment onto skin. The smudge is the price of ink that prints quickly on paper built to be cheap and absorbent. Fresh papers and heavily inked areas, such as dark photographs, are especially likely to leave a trace.
