Hi thanks for your help!!
I spent 4 days trying to make this soap but I don't feel satisfied with the result. What can I do?
I tried to add volumetric absortion but it didn't provide good enough result either.
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This is closest I can get. It is kind a partial answer but it could be starting point for you.
I've used fot this Subsurf Scattering shader added to Translucent shader and then mixed with Glossy shader by Fresnel to give it fake PBR look.
Here is a node setup:
And .blend file: