Student Creates Nail Polish That Works on Touch Screens

Manasi Desai noticed something many of us have experienced: some people simply can't get their phones to respond to their touch.

The chemistry student at Centenary College of Louisiana started her project after meeting a phlebotomist with long nails who struggled to operate her smartphone. Guitar players with callused fingertips face the same problem. Their nails and hardened skin don't conduct electricity the way regular fingertips do, so touch screens ignore their taps completely.

Desai teamed up with her professor, Joshua Lawrence, to create a solution. Their goal was simple: develop a clear polish that could go over any manicure and make fingernails work like fingertips on screens.

Touch screens work through capacitance, detecting tiny electrical disruptions when your finger touches the glass. Regular fingernails can't create that disruption because they don't conduct electricity. Previous attempts to solve this used carbon nanotubes or metal particles, but those ingredients are dangerous to breathe in and limit polish colors.

Desai took a different approach. She tested 13 clear-coat polishes combined with over 50 different additives, searching for a formula that was clear, safe, and conductive.

Her winning combination uses taurine (an amino acid) and ethanolamine (an organic molecule). Together, they create a polish that works through acid-base chemistry, with protons hopping between molecules to mimic how our skin conducts electricity. When she applied it to fingernails and tested it on smartphones, the screens registered every tap.

The polish isn't ready for store shelves yet. Current versions only work for hours or days before losing effectiveness, and the researchers want it to last for weeks. The least toxic version they've created so far has a gritty, speckled finish that needs improvement.

The Ripple Effect

This invention could help millions beyond people with long nails. Carpenters, musicians, healthcare workers, and anyone with dry skin or calluses could suddenly use their phones without frustration. The researchers have already filed a provisional patent and are refining their formula.

Lawrence put it best: "Chemists are here to solve problems and to try to make your world better."

Desai presented her research at the American Chemical Society's annual meeting, turning a simple observation into potential relief for countless smartphone users everywhere.