Dyes are colorants most suitable for printing on fabrics. This is because dyes are specifically designed to penetrate and bond with the fibers of fabrics, resulting in vibrant and long-lasting colors. Additionally, dyes are able to produce a wider range of colors compared to other types of colorants, which is important for creating intricate and detailed designs on fabrics. While dyes can also be used for other applications such as painting on walls or printing on papers, they may not produce the same level of vibrancy or durability as they do on fabrics.