Ultramarine RS 51 is widely used alone to obtain a bright, transparent shade of blue, or in combination with other pigments such as titanium dioxide, with which it gives an attractive pastel shade.

Ultramarine RS 51 is intended as a general purpose pigment with applications in paint, ink, soap, cosmetics and many other industries, particularly those in which a high tinting strength is required. Ultramarine RS 51 can be used in plastics.