Development of Conductive Nail Polish for Touchscreen Use

Researchers at Centenary College of Louisiana have developed a prototype of a clear nail polish designed to enable long fingernails to function as touchscreen styluses. This innovation addresses a common issue faced by individuals with long nails, who often struggle to interact with capacitive touchscreens on smartphones and tablets. The project was initiated by undergraduate student Manasi Desai, under the guidance of her research supervisor, Joshua Lawrence, an associate professor of chemistry. Their findings were presented at the American Chemical Society's spring meeting in March 2026.

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Capacitive touchscreens, which are prevalent in modern devices, rely on the conductivity of materials to register touch. When a conductive object, such as a fingertip, disrupts the electric field on the screen, it registers as a touch. However, non-conductive materials, like fingernails, do not affect this electric field, leading to difficulties for users with long nails or calloused fingertips. Previous attempts to create conductive nail polish involved hazardous materials like carbon nanotubes, which limited color options and posed health risks during manufacturing.

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Desai and Lawrence aimed to create a safe, clear nail polish that could be applied over any manicure. They tested combinations of 13 commercially available clear nail polishes and over 50 additives to find a formula that was both nontoxic and conductive. Their research identified two key ingredients: taurine, a non-toxic amino acid, and ethanolamine, an organic molecule that provides the necessary electrical properties. The combination of these ingredients allows the polish to interact with the touchscreen's electric field through acid-base chemistry, enabling it to register touches.

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Despite promising results, the prototype nail polish is not yet ready for commercial use. The current formulations lose effectiveness after a few hours, and the least toxic version produces a gritty finish that lacks aesthetic appeal. The researchers are actively working to refine the formula to enhance its durability and ensure it remains nontoxic. They have submitted a provisional patent for their invention, indicating a commitment to further development.

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Desai expressed the dual benefits of the polish, stating, "Our final, clear polish could be put over any manicure or even bare nails, which could help people with calluses on their fingertips too." Lawrence emphasized the goal of chemists to solve practical problems, noting, "Chemists are here to solve problems and to try to make your world better."

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While the research has been well-received, some experts caution that the reliance on ethanolamine raises toxicity concerns. The researchers acknowledge these issues and are committed to finding safer alternatives.

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The team plans to continue testing new compounds to improve the polish's effectiveness and stability. Their ongoing research aims to create a commercially viable product that meets safety and aesthetic standards, potentially transforming how individuals with long nails interact with touchscreen devices.

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