I was following this tutorial to render a glass bottle with some jet red liquid inside it and the final render is as under
I’ve described the problem in the image itself. Jonathan described something similar in the tutorial like
The inner surface of the glass jar and the outer surface of the liquid is the same and hence you will either see dark liquid or artefacts Hence we need to remove the inner faces.
But I seriously dint get what he was talking about. Hence I’ve turned to BA.
I am attaching my blend file for ref - Liquid Bottle.blend (652 KB)