  Intending to solve the decade old problem of solar opacity, we report
substantial photoabsorption uncertainty due to the effect of ion-ion
correlations. By performing detailed opacity calculations of the solar mixture,
we find that taking into account the ionic structure changes the Rosseland
opacity near the convection zone by about 10%. We also report about 15%
difference in the Rosseland opacity for iron, which was recently measured at
the Sandia Z facility, where the temperature reached that prevailing in the
convection zone boundary while the density is 2.5 times lower. Finally, we
propose a method to measure opacities at solar temperatures and densities that
were never reached in the past via laboratory radiation flow experiments, by
using plastic foams doped with permilles of dominant photon absorbers in the
Sun. The method is advantageous for an experimental study of solar opacities
that may lead to a resolution of the solar problem.
