DOCUMENT CONTAINING UV ABSORBING SECURITY MARK

1 . A document with a security marker comprising:

a substrate comprising an optical brightener;

a background comprising an ultraviolet (UV) absorbing material arranged in a first pattern of lines having a first frequency and a first orientation; and

a security mark comprising the UV material arranged in a second pattern of lines having a second frequency and a second orientation.

2 . The document of claim 1 wherein the predetermined security mark is selected from a group consisting of an image, a logo, a series of numbers or letters or both, a bar code, or a hash tag.

3 . The document of claim 1 wherein the first orientation differs from the second orientation by at least 10 degrees.

4 . The document of claim 1 wherein the orientation of a lenticular lens differs from either the first orientation or the second orientation by less than 5 degrees.

5 . The document of claim 1 wherein the first frequency is equal to the second frequency.

6 . The document of claim 1 wherein the first orientation is equal to the second orientation and the first and second frequencies are different.

7 . The document of claim 1 wherein UV illumination directed at the security marker and a lenticular lens is used to authenticate the security mark.

8 . The document of claim 1 wherein the frequency of the lenticular lens is a multiple of the first or second frequency.

9 . The document of claim 7 wherein the frequency of the lenticular lens is equal to the first or second frequency.

10 . The document of claim 7 wherein the authentication is a visual match with a predetermined security mark.

11 . The document of claim 1 wherein an image capture device UV illumination directed at the security marker is used to authenticate the security mark.