Light-blocking articles with high opacifying layer

A foamed, opacifying element comprising a porous substrate and a dry foamed composition disposed on at least one supporting side of the porous substrate, forming a dry opacifying layer,

• wherein the dry foamed composition comprises:
• (a) at least 0.1 weight % and up to and including 40 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 sec−1 in ethyl acetate at a concentration of 20 weight % at 25° C.;
• (b) at least 10 weight % of an at least partially cured binder material;
• (c) at least 0.2 weight % of one or more additives comprising a surfactant;
• (d) less than 5 weight % of water;
• and
• (e) at least 0.002 weight % of an opacifying colorant different from all of the one or more (c) additives, which opacifying colorant absorbs predetermined electromagnetic radiation,
• all amounts being based on the total weight of the dry foamed composition,
• wherein the dry opacifying layer has a light blocking value of at least 4 as well as a luminous reflectance that is greater than 40% as measured by the Y tristimulus value.