A college student in the United States has developed a prototype nail polish that can turn a fingernail into a touchscreen stylus, offering a simple solution for people who struggle to use smartphones.
Manasi Desai, a student at Centenary College of Louisiana, created the concept after noticing that long nails and calloused fingertips often fail to register on touchscreens. She worked with her research supervisor, Joshua Lawrence, an associate professor of chemistry, to design a practical and safe solution.
The team presented their research on March 23 at the American Chemical Society’s annual meeting.
A simple fix for a common problem
Touchscreens are widely used, but not equally accessible. People with calluses, very dry skin, or long nails often face difficulty when using smartphones. Devices may also fail to respond when hands are gloved.
The idea gained traction after the researchers spoke with a phlebotomist who struggled to use a phone due to long nails. The response to a touchscreen-compatible polish was immediate and positive, prompting the team to further develop the concept.
How the polish works
Modern touchscreens rely on capacitance. The screen creates a small electric field that reacts when a conductive object, such as a finger, touches it. This interaction allows the device to detect input.
Fingernails do not conduct electricity, which is why they cannot activate screens. The new polish addresses this limitation by enabling the nail surface to behave more like human skin.
A prototype nail polish could turn long fingernails into touchscreen styluses.#technology #stylus #nailpolish pic.twitter.com/IZuZ4X0hHz
— Tom Marvolo Riddle (@tom_riddle2025) March 24, 2026
Instead of using metal particles, which can pose safety risks, the researchers developed a formula based on acid-base chemistry. Desai identified two key ingredients: taurine and ethanolamine. When combined, these compounds allow protons to move across the surface of the polish.
Lawrence explained that this movement mimics the way electrical signals travel through skin. As a result, the coated nail can register touch on a screen.
Development and testing
Desai tested combinations of 13 clear nail polishes and more than 50 additives to find a formula that met three conditions. It had to remain clear, be safe to use, and provide enough conductivity for touchscreen interaction.
The final formulation meets these requirements while remaining compatible with both bare nails and manicures.
Challenges remain
The polish is still in early development. Its main limitation is durability. Current versions lose effectiveness after a short time, often within hours or days.
Researchers are working to extend its lifespan so it remains functional for longer periods. They are also refining the formula to improve both safety and appearance. A less toxic version has already been developed, but it produces a rough finish that does not meet cosmetic standards.
The team has filed a provisional patent for the invention. Lawrence described the work as a strong proof of concept but said further testing is needed before the product can reach the market.
