Visible edges in Ian McGlasham's "ALICE" fluid sim animation

The fluid simulation looks good, but I noticed visible edges around the letters, especially the curved or inclined letters like ‘A’ and ‘C’, resembling artifacts. I’m wondering if this can be fixed?

Here’s what I mean. It starts right in the beginning:

And it remains visible throughout the animation. I don’t know what causes them, but they resemble edges to me.

Since Ian is a great and well-experienced artist, I was just wondering if this effect/artifact is fixable at all.

The ALICE animation was created in Blender 2.49 which used a different liquid simulator than in newer Blender versions called ‘El-beem’. An issue of this simulator is that it created these noticeable ‘stairstepping’ artifacts against curved obstacles.

In Blender 2.82 and later, the liquid simulator was replaced with a newer ‘Mantaflow’ fluid simulation system. These types of artifacts are less noticeable in this simulator but if they are a problem, the Domain > Liquid > Fractional Obstacles option can be used to smooth the fluid-obstacle boundary.

image

https://docs.blender.org/manual/en/latest/physics/fluid/type/domain/settings.html
Fractional Obstacles
Enables finer resolution in fluid / obstacle regions (second order obstacles). This option reduces the “stepping effect” that results when an obstacle lies inclined inside the domain. It also makes liquid flow more smoothly over an obstacle.

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