The geometric mean particle diameter of the particulate bleach component is below 500νm.

Disclosed is a cellulose fine particle having small particle size and high average polymerization degree.

A nickel fine particle, which is a ring body having a ring shape, is formed by oxidizing a nickel chloride fine particle and then reducing the same.

In each conductive fine particle, a conductive layer and a low-melting-point metal layer are sequentially formed on the surface of a base fine particle.

The coated conductive particle is composed of a particle having a conductive metallic surface and insulating fine particles covering the surface of the particle having a conductive metallic surface.

Disclosed is a method for producing a novel cobalt oxide fine particle.

The above electroconductive fine particle has an electroconductive layer being less susceptible to breaking, is improved in impact resistance, and is excellent in the adhesion between its base fine particle and electroconductive layer.

An ultraviolet-absorbent fine resin particle is obtained by dehydrating the above resin.

Thus, the fine catalyst particle is fixed to the tip part of the CNH (100).

The fine particle has a mean particle diameter (R) which is greater than the wavelength of light incident upon the optical function layer.

Also provided is a drug composition that contains the enteric-coated fine particle.

The cellulose fine particle has an average particle diameter of 9-400 nm and an average polymerization degree (DP) of cellulose of 150-3000.

A black toner has a toner particle including at least a resin (a) having a polyester as a main component, carbon black, and a wax, and a fine inorganic particle.

Many behavioural aspects of fine particle systems come about simply because of the relatively large amount of surface exposed to its surroundings.

Provided is a nickel fine particle which can easily form a conductive path when added to a conductive paste.