In pigments, nano sized iron oxide is also known as transparent iron oxide (through iron) . The so-called transparency, not specifically refers to the particles themselves macroscopically transparent, but refers to the pigment particles dispersed in the organic phase to make a film (or oil film) , when the light irradiation on the film, if the original direction does not change basically through the paint film, it is said that the pigment particles are transparent. Transparent iron oxide mainly has 5 varieties, namely transparent iron red, yellow, black, green, Brown. Transparent iron oxide pigment has high color, high tinting power and high transparency because of its 0.01 μm particle size. It has good abrasive dispersion after special surface treatment. Transparent ferric oxide pigment can be used in oil and alkyd, amino alkyd, acrylic and other paints to make transparent paint, has good decorative. The transparent paint can be mixed with the color paste of other organic color pigments either alone or by adding a small amount of non-floating aluminum powder slurry to make a metallic effect paint with flicker feeling, can be used for cars, bicycles, instruments, instrumentation, wood and other high requirements of decorative occasions. Due to its strong absorption of ultraviolet radiation, the iron permeating pigment can be used as a UV shielding agent in plastics and used in packaging plastics such as beverages and pharmaceuticals. Nano-sized iron oxide black also has a broad application prospect in electrostatic shielding coatings. At present, Fe3O2 nano-sized coatings with good electrostatic shielding have been developed successfully. The semiconducting nanoparticles have a higher conductivity than conventional oxides at room temperature and thus can act as an electrostatic shield.