Water-activated color change; repeatedly reversible without revealing the underlying layer; smooth printing performance; suitable for anti-counterfeiting labels and children's picture books.

Water-sensitive color-changing ink reveals or hides color instantly upon contact with water and reverts to its original state once dry; the process is reversible, and the color-change response is sharp and distinct. It is eco-friendly, non-toxic, and non-irritating, offering excellent adhesion to various substrates such as paper, self-adhesive materials, and laminated products; it is suitable for both screen and flexographic printing. Commonly used for anti-counterfeiting labels, educational stickers for children, water-contact toys, beverage packaging, and waterproofing test indicators, it offers hidden watermark-style security that is difficult to replicate. Durable and resistant to abrasion, it comes in a wide range of colors and adapts well to production processes, significantly enhancing product differentiation and security levels.