>
> Thank you very much!
> I am using v3.6. I changed the code according to your advice. The new rendering
> result has some strange white light regions on the jello surface. How can I get
> rid of that? (I can see it does not appear when I change ior to 1.0).
>
> Also, if you could please look at the sample image
> (http://s7.postimage.org/g4a0ahgrf/Untitled.png) again, you can see very shiny
> effect inside it. I'm also wondering how to get a photon mapping like that? I
> can tell it is not a result of scattering media.
>
> Thanks again!

You can reduce the transparency value of the pigment.
Example:
pigment{rgbt<1,1,1,0.7>}

You can try reducing the maximum reflection value.
Example:
reflection{0.01, 0.7 fresnel}

It's possible that the reference image use an unrealistic ior value.
It's also possible that it contains some emissive media.
It may use intside_texture with a larger reflection value and less 
transmition.
It may have been post processed.

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