Indigo

Ultramarine pigment is the oldest and brightest blue pigment, non-toxic, eco-friendly, and falls under the category of inorganic pigments.

It is used for whitening, capable of eliminating the yellow light in white paint putty, white cement, and other construction materials or other white pigments. It is water-insoluble, alkali-resistant, and heat-resistant, extremely stable against sun exposure and weathering in the atmosphere, but is not acid-resistant and will decompose and change color when exposed to acid.