Nocopi Technologies develops and sells specialty reactive inks for two applications: entertainment and toy products, and anti-counterfeiting. The entertainment segment, which accounts for roughly 84% of revenues, is built around Nocopi's "Rub-it & Color" technology — inks that reveal color when rubbed with a fingernail or firm object, used in coloring books, activity kits, greeting cards, and board games. The anti-counterfeiting segment uses Nocopi's "Copimark" and "Rub & Reveal" technologies, which allow businesses to print invisible authenticating marks on documents, labels, and packaging, revealed only by rubbing or a special pen. Nocopi makes money through two channels: licensing its proprietary ink technologies to customers under multi-year agreements, and selling the physical inks directly to licensees and their printers. Revenue is highly concentrated — the top two customers together represented about 75% of total revenues in 2025. A majority of revenues come from international licensees, even though Nocopi manufactures domestically at a single facility in King of Prussia, Pennsylvania, and operates with only seven full-time employees. Nocopi's growth strategy focuses on expanding Rub-it & Color licensing into new geographies, renewing existing agreements, growing the anti-counterfeiting business, and pursuing acquisitions of companies with complementary or competing technologies.