to apply a variety of forms of marks including a digitized code for fingerprints a person 39 s social security or drivers license number a person 39 s birthday or any other series of numbers for that matter designs and logos can be applied as a mark for creating a permanent impression thereof which is perceptible only in the presence of uv radiation the invention will be described with particularity for utilizing fingerprints as the invisible mark applied for labeling an object though such description is by way of illustration and not limitation of the present invention additionally pad 28 has been suitably sized to permit a thumb to be applied thereto for applying a thumbprint to the personal property being labeled referring now to fig7 integral writing instrument uv light source 16 is depicted integral writing implement 16 includes a housing in which is disposed an ink reservoir terminated with a writing nib the ink housed contains an agent ultraviolet uv sensitizer infrared ir phosphor wherein the ink is visible only in the presence of select wavelengths of energy a generator for generating the select wavelengths of energy also is disposed within the housing and is oriented to illuminate the ink dispensed by the writing nib the housing also contains a switch to selectively actuate the generator advantageously the writing nib is retractable into said housing and.