Method of transparentizing paper subtrate and paper assembly with transparentized window

A method of transparentizing a defined area of a paper substrate, the method comprising:

• providing the paper substrate having a first surface and a second surface opposite to the first surface, the paper substrate being substantially planar;
• providing a first applicator having a surface with a substantially similar area as the defined area of the paper substrate to be transparentized, wherein the defined area is less than an area of the first surface of the paper substrate;
• dispensing a first quantity of a transparentizing material to the surface of the applicator;
• contacting the surface of the applicator to the first surface of the paper substrate at a desired position of the defined area to apply the first quantity of the transparentizing material and to prevent migration of the transparentizing material beyond the defined area;
• exposing the first surface of the paper substrate to a first heat source such that heat produced by the first heat source impinges the transparentizing material to facilitate penetration of the transparentizing material into the paper substrate;
• and
• exposing the first surface of the paper substrate to a first source of ultraviolet radiation such that the ultraviolet radiation cures the transparentizing material.