The attenuation in the refraction tab doesn't act like i want it to. For example it doesn't attenuate the object inside the liquid.

I have a glass with straw filled with some sort of dark juice. The straw appears clear at all times even when attenuation is high.

I'm using surfacemodel

are your liquid i closed surface. ex. like a sphere/box and not a 2D-plane?

any render or scene to illustrate your problem?

send a test file.