Abstract: An aqueous functional composition formulation is used to provide a functional composition in foamed, opacifying elements useful as a light-blocking articles. The aqueous functional composition formulation comprises: (i) glass particles such as hollow glass particles at a coverage of 0.1-2.2 g/cm2 and a (iv) water-soluble or water-dispersible organic polymeric binder that may be crosslinked. Thickeners, coating aids having an HLB of at least 5, (ii) lubricants, (iii) tinting materials, and (v) crosslinking agents can also be present in the aqueous functional composition formulation. Among other properties, the presence of the glass particles provides heat absorption capacity for the foamed, opacifying elements.