Hi Giovanni,
Here milk through the coffee.
With number 1 the dissolving is faster.
2, 3 and 4 the milk clouds are sharper at the edges.
I hear what your preference is?
It is recorded in a normal glass which is my preferred method, you then immediately have the feeling that it is in a glass, the rounding takes place.
I shot it a bit wider but this is of course for close-ups
The shots are in 500 frames
1: Basic coffee, Basic milk
2: 60% coffee, 40% gl -milk 10% gl 90% -milk worp 15ml -random glass
3: 60% coffee, 40% gl -milk 10% gl 90% -milk worp 15ml -random glass
4: 60% coffee, 40% gl -milk 10% gl 90% -milk worp 15ml -random glass