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

Colors of PSi powders before and after HWA. Actual pictures of the powders can be seen in Figure 1.

Gelloz et al. Nanoscale Research Letters 2012 7:382   doi:10.1186/1556-276X-7-382