I am following a beginner tutorial on Blender Guru’s YouTube channel.

I am creating a glass cup with liquid inside, and I am using the Volume Absorption settings on the Material panel in order to create the desired effect on the liquid.

As far as I know, I’ve followed the tutorial exactly, but as you can see from the attached image. There is some odd yellow/gold band as the top front of the liquid.

Normally, I would experiment with different settings, but as a complete beginner, I don’t really know where to go and what to adjust. With my extremely limited experience, I think it is something to do with reflections, as it looks like there is something else going on with that area, but I haven’t really got a clue.

Can someone please point me in the right direction?


Picture of cup with coffee inside. There is a weird yellow/gold band at the top of the liquid

  • $\begingroup$ Hello :). Could this be a reflection from an HDRI? blender.stackexchange.com/q/170533/78972 $\endgroup$ Jul 14, 2020 at 17:11
  • $\begingroup$ That’s what I was thinking, although I didn’t know what it was called. I will certainly give that a try. Am I able to set it to something generic that wouldn’t give me those reflections? Also, how would I do that? Thanks. $\endgroup$ Jul 14, 2020 at 17:28
  • $\begingroup$ Follown the link, it's all explained there :). $\endgroup$ Jul 14, 2020 at 17:31
  • $\begingroup$ Thanks Jachym. Ok, I am reeeally beginner so I’m not sure where all the options are :) I’ll try it out later and see if I can get through it. $\endgroup$ Jul 14, 2020 at 17:41
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    $\begingroup$ It is because the liquid overlapping with the glass. If you are talking about the yellow looking area. This happened to me too. $\endgroup$ Jul 14, 2020 at 18:11

1 Answer 1


I think I managed to fix it. After experimenting with the scale of the liquid and HDRI and shading settings, I found out it was neither of these.

I hid the liquid by using the eye icon while in render view and I noticed the line was still there, and when I switched to object view, it still looked like there was a still a liquid shape. What I think I did was duplicate the vertices and right clicked rather than make a separate object. I then created a new liquid layer on top.

So what I did was click on the cup in Edit Mode and then Merge Vertices > By Distance. This effectively removed that additional liquid layer I had in the cup object.



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