Ultramarine pigments made by Shree Krishna Ultramarine Pigments (P) Ltd, are widely used to enhance the effects of opticalbrightening agents in improving whiteness of laundered fabrics. They do notstain 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 redextremes of spectrum, thus absorbing only unwanted yellow component. With mostother blues having greener undertone, hence in addition to absorbing yellowcomponents they also absorb red component, therefore cannot provide a balancedcorrection as delivered by Ultramarine pigments.