I have found this interesting paper about Volumetric Materials.These paper includes the most complete measured values i have found so far.This means it has absorption coefficents,scatter coefficients and the Heney Greenstein g values.
Here my render tests,keep in mind the test slabs in the paper are only 1mm 2.5mm and 10mm thick.i have put in the values as there are in the chart, and increased the densitys to match the colorpicker of the paper images,since shader ball has not the same size as the slabs in the paper.
I made the test, what i was talking about in the spectral thread.I divided each rgb absorption and scatter value by 10.Then i increased the density from 100 multiplyed with the dividing factor 10 to 1000 to get the absorption and scattering back.It seems to work.
