Rapid Fast Dyes are known to be most commonly used for textile printing applications. They are considered best for cotton, viscose, rayon, & polyester fabrics. These are stabilized azoic dyes that provide highly bright shades with good fastness properties. They are generally developed under acidic conditions for getting excellent effectiveness. These dyes are also suitable to be used for plastic and leather items. They show superior solubility in the appropriate solvent with high water resistance. Rapid Fast Dyes have a sharp smell and are said to show superior thermal stability.