Ultramarine RS 21

Sodium Alumino Sulphosilicate. Acts as a general purpose pigment. It is a medium tinting strength, mid shade Ultramarine blue. Is heat fast, light fast and easy to disperse. Offers poor acid fastness and good alkali fastness properties. It 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.