Hello!
Look please in the article
http://www.richardrosenman.com/vray.htm
There are some images about absorbtion of light - Venus, dragon. How is it possible to do this absorbing material?
hi
you have to play around with the Translucent part of the vray materials…
play around with it and see what happens 
Also, see this thread - http://www.chaoticdimension.com/forums/phpBB2/viewtopic.php?t=2535&highlight=absorption
Once you have the glass down, you can easily adapt it to be a wax-like material.
Thank you for advices, guys!
The thread is very intersting. I will do materials as there for beginning.