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Table 1 HWA effect on the color of PSi powders as a function of porosity

From: Luminescence of mesoporous silicon powders treated by high-pressure water vapor annealing

Name Porosity Initial color Color after HWA
P54 54 % Dark brown Light brown
P64 64 % Dark brown Light tan
L8 69 % Dark brown Light tan
L9 84 % Dark brown Off-white
  1. Colors of PSi powders before and after HWA. Actual pictures of the powders can be seen in Figure 1.