Why is the green fluorescent whitening agent KCB a good product, but not green is bad? This has to start a long time ago. Our ancestors used a whitening agent, a natural whitening agent-ultramarine blue, which is very special blue.
Ultramarine pigment is the oldest and brightest blue pigment, non-toxic, environmentally friendly, and belongs to the category of inorganic pigments.
Ultramarine is used for whitening. It can eliminate the yellow light in white paint or other white pigments. It is insoluble in water, resistant to alkalis, and resistant to high temperatures. It is extremely stable to sunlight and wind and rain in the atmosphere, but it is not acid resistant and will decompose and change color when exposed to acid.