Bicolor security fiber: The fibers can be added in the paper pulp to making the security paper. When they are distributed in the paper, and they can be found under the natural light. There are two different colors such as "blue and red" on a fiber, the two colors are at opposite ends of the fiber. The fibers can be extracted from the paper using the needle.

Invisible three-color fluorescent security fiber: The fibers can be added in the paper pulp to making the security paper. They are colorless(white), when they are distributed in the white paper, they are invisible under the natural light, and they can fluoresce under the long-wave ultraviolet light. There are three different colors such as “red, green and blue” on a fiber, the three colors are arranged by the same order. The fibers can be extracted from the paper using the needle.

Invisible Invisible UV excitation fiber (also called colorless UV fluorescent fiber): The fibers are usually used to be mixed in the paper pulp to make the security paper. They are colorless (means white) under the natural light so that they are invisible in the white paper under the natural light, while they can fluoresce (such as red, green, blue) under the ultraviolet light. The fibers can be extracted from the paper by using the needle.

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