While the theoretical possibility of achieving near-perfect diffuse reflectance in a purely scattering material is longstandineu, no attempt seems to have been made to develop scatterers with albedos of 0.999 and beyond. Such ultra-high albedo diffuse scatterers are now of interest because they offer the possibility for the development of shields against high levels of laser radiation(2).
Perry Miles, Perry Miles,
"Physical limits on ultra-high Albedo diffuse reflectors", Proc. SPIE 1438, Laser-Induced Damage in Optical Materials 1989, 14380R (1 November 1990); doi: 10.1117/12.2294436; https://doi.org/10.1117/12.2294436