How can we check the quality of natural pigment?
Pigments obtained from vegetable, animal and mineral products are hardly used nowadays. When they are still in use, they are convened into a usable condition by various physical and chemical methods such as purification, size reduction, micronisation, surface treatment etc.
Among the simplest tests are colour stability, particle size, particle size distribution, hiding power, presences of constituents soluble in water, acids or alkalis, particle shape, wettability, alkalinity and hardness.
Quality of Natural Pigments
Blog, Updated at: 8:35 PM
