Provided is a method of producing a transparent porous film by which a transparent porous film having excellent transparency and excellent thickness accuracy can be produced through spray coating. The method of producing a transparent porous film according to an embodiment of the present invention includes a step of spray coating a base material with a transparent porous film-forming paint containing particles and a dispersion medium in which the particles are dispersed to form a coating film so that a solid content concentration change rate satisfies the following formula (1): 1.3solid content concentration change rate60 . . . (1) (in the formula (1), the solid content concentration change rate represents a solid content concentration in the coating film 10 seconds after the spray coating with respect to a solid content concentration in the transparent porous film-forming paint before the spray coating).

Embodiments of methods for forming strengthened glass articles comprise providing an exchangeable glass substrate having a coefficient of thermal expansion (CTE) between about 6010-7/ C. to about 11010-7/ C., depositing at least one decorative porous inorganic layer onto at least a portion of the surface of the glass substrate, wherein the decorative porous inorganic layer comprises a glass transition temperature (Tg)450 C., a glass softening temperature (Ts)650 C., wherein the difference in CTE values between the glass substrate and the decorative porous inorganic layer is within 1010-7/ C.; and curing the glass substrate and the deposited decorative porous inorganic layer at a temperature greater than the Ts of the decorative porous inorganic layer; and chemically strengthening the cured glass substrate and the decorative porous inorganic layer thereon via ion exchange at a temperature below the Tg of the decorative porous inorganic layer.