Method of making light-blocking high opacity articles

A method for providing a foamed, opacifying element, the method comprising:

• providing a foamable aqueous composition that has at least 35% solids and up to and including 70% solids, and comprises:
• (a) at least 0.05 weight % and up to and including 15 weight % of porous particles, each porous particle comprising a continuous polymeric phase and a first set of discrete pores dispersed within the continuous polymeric phase, the porous particles having a mode particle size of at least 2 μm and up to and including 50 μm and a porosity of at least 20 volume % and up to and including 70 volume %, and the continuous polymeric phase having a glass transition temperature greater than 80° C. and comprising a polymer having a viscosity of at least 80 centipoises and up to and including 500 centipoises at a shear rate of 100 see in ethyl acetate at a concentration of 20 weight % at 25° C.;
• (b) at least 20 weight % of a binder material;
• (c) at least 0.0001 weight % of one or more additives comprising a surfactant;
• (d) water;
• (e) at least 0.001 weight % of an opacifying colorant different from all of the one or more (c) additives, which opacifying colorant absorbs electromagnetic radiation of all wavelengths of from 350 nm and up to and including 800 nm,
• all amounts based on the total weight of the foamable aqueous composition;
• aerating the foamable aqueous composition to provide a foamed aqueous composition having a foam density of at least 0.1 g/cm3 and up to and including 0.5 g/cm3;
• disposing the foamed aqueous composition onto a surface of at least one supporting side of a porous substrate;
• drying and at least partially curing, simultaneously or in any order, the foamed aqueous composition to provide a dry foamed composition;
• and
• densifying the dry foamed composition to provide a dry opacifying layer of a foamed, opacifying element.