Refill ink is bottled ink used to refill ink cartridges or ink tanks in printers, commonly in inkjet models. It’s a cost-effective alternative to buying new cartridges, as it extends the life of the existing cartridge. Refill ink is available in various colors, typically black, cyan, magenta, and yellow (CMYK), allowing for both monochrome and color printing. Many brands offer refill ink specifically formulated for their printers to maintain print quality and prevent clogs. Refilling is usually done with syringes or directly into ink tanks in tank-based printers. Refill ink is popular among users who print frequently, as it reduces waste and printing costs while providing high-quality, consistent output.