Ultramarine pigments made by Shree Krishna Ultramarine Pigments (P) Ltd, are widely used to enhance the effects of optical brightening agents in improving whiteness of laundered fabrics. They do not stain or build up with repeated use. Effectiveness is due to the reflectance characteristics of this pigment. As Ultramarine has redder undertone, it reflects at both blue as well as red extremes of spectrum, thus absorbing only unwanted yellow component. With most other blues having greener undertone, hence in addition to absorbing yellow components they also absorb red component, therefore cannot provide a balanced correction as delivered by Ultramarine pigments.