The fibers can be added in the paper pulp to making the security paper. When they are distributed in the paper, they can be found under the natural light, they can fluoresce(such as red) under the long-wave ultraviolet light and fluoresce(another color such as green) under the short-wave ultraviolet light. The fibers can be extracted from the paper using the needle.

Anti-counterfeit fiber(anti-forgery fiber, anti-clone fiber, authentication fiber, tracing and tracking fiber, anti-theft fiber, traceability fiber, security fiber):

The fiber's length is between 1 millimeter and 10 millimeters, it's diameter is between 20 micrometers and 100 micrometers. There are three major types of the fibers: 1, Visible security fiber (such as red, green, blue, also called visible fiber). 2, Invisible security fiber (also called colorless UV fluorescent security fiber), it can fluoresce(such as red, green, blue) under the ultraviolet light. 3, Composite fiber: There are more than one anti-counterfeit features on a fiber which can be made by customer's order.

The paper is usually used to make the packaging of products. Sometimes the paper of the packaging need to be added some anti-counterfeit features. To add the security fiber in the paper pulp is a effective method to make the anti-counterfeit paper, another method is to distribute the fiber on the surface of the paper which is covered by the glue. It is very difficult to counterfeit the packaging which is made by the paper with security fibers.