Thanks!  I hear what your saying about the liquid - along with the reflection I also could add a 'glow' from the liquid giving the barrels a green tint. Hmm that will mean more colours.... needs tinkering with. Thanks for feedback!

I like usage of lines to define the material of barrels. Maybe add more reflection on the liquid where needed to lower it's viscosity, it looks gluey and the drop doesn't fall that slow, yet, I don't have much experience how radioactive liquids react anyway. Good job man :)