Software developer Marco Chiappetta has built a Google Chrome extension that can detect attempts to fingerprint text using the "zero-width character" technique.

The arches, loops and whorls that make each person’s fingerprints unique are created by some of the same genes that drive limb development 1. Sijia Wang at the Shanghai Institute of Nutrition ...

If the fingerprint was indeed applied before the text was printed, the printed characters will be visible on the fingerprint, as the printer ink masked parts of it from the gelatine.