Glass with water troubles

I’ve mad a glass with water but the water is getting black:

There’s almost the same material on the glass and the water and the reflection and refraction are set to 10 bounces. Right now there’s a little space between the water and the glass, but I also tried the opposite and got the sam resault.

I think you have to set the depth of the Ray transp high … to six or something like that. And also set de IOR of the glass to 1.55 and water’s to 1.36.
Hope this helps you.

in the yafray tab there is a little bar that says “raydepth” by default it’s set to 5. increas it’s value to 10 or even higher,