Method of manufacturing colorful thermal insulation film

A method of manufacturing a colorful thermal insulation film, comprising:

• A:
• preparing a substrate formed by one of a transparent glass material or a transparent polyethylene terephthalate (PET) material;
• B:
• coating a metal adhesion layer on the substrate;
• C:
• coating a layer of aluminum-containing material over the metal adhesion layer;
• D:
• anodizing by placing the substrate coated with the metal adhesion layer and the layer of aluminum-containing material coated over the metal adhesion layer in an acidic solution and applying a voltage thereto until the layer of aluminum-containing material is completely converted into a porous anodic aluminum oxide (AAO) layer;
• E:
• pore-widening by placing the anodized substrate coated with the metal adhesion layer and the layer of aluminum-containing material coated over the metal adhesion layer in phosphoric acid for changing a porosity of the AAO layer to adjust a perceived color of light reflected therefrom;
• F:
• coating and connecting the AAO layer with changed porosity with a metal thermal insulation layer to form the colorful thermal insulation film;
• and
• G:
• applying the colorful thermal insulation film to one of a window or a viewing screen, and wherein the applied colorful thermal insulation film has a rate of light transmittance of 20-30% over a wavelength range of 400-800 nm.