Dyes are colourants most suitable for

Dyes are colorants that are most suitable for printing on fabrics. Dyes have the ability to penetrate the fibers of the fabric and bond with them, creating a lasting and vibrant color. This is why dyes are commonly used in textile industries to produce colorful and long-lasting fabrics for clothing, upholstery, and other decorative purposes. While dyes can also be used for painting on walls or drawing on canvas, they are less suitable for these purposes as they do not adhere as well to the surfaces and are not as fade-resistant over time. For printing on papers, inks are typically used instead of dyes. Therefore, the correct answer is the option "printing on fabrics".