Rolf,
No, they did not just roll the tape backwards.  I sent the link
to my son, who is a MIT trained mechanical engineer, and he said
he saw it done in on of his classes.

Jim

Thanks Jim,

It just seems so unreal.
However, if it was witnessed by your son, no reason not to trust it
happening.

Do you know what the base fluid is?
Just water or some kind of gel? Perhaps with a substance added that
provides a gel like characteristic that prevents mixing on its own.

I don't think it will work in plain water.
A colored fluid added disperses in water and you can?t get it back to
one spot.
The base fluid in the jar must have been something else, preventing
mixing at rest.
That is preventing mixing, period.

What we saw is a 'distribution' of the colors over a distance, here
circular.
The base substance with the non-mixing colors is being 'stretched-out'
and then moved back.
When 'turned back' it goes back to its original location. That is possible.
It all depends on the basic fluid in the jar.

Rolf

Rolf,
I have seen the demonstration many times.  The base fluid is glycerin.
The demonstration  is particularly convincing when viewed from the top.
As I recall, the three color drops are injected at different radii.  The
injected fluid is probably also glycerin with food coloring added.

Aubrey Thompson



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