How do “blue water boxes” from zoos and other places actually work? How can a small figure stand on the “blue water”?

Question

I have no idea what they are actually called, but I have one of them with two penguins on it, and I wonder how they stand on the blue liquid?

In: 5

Answer 1

The blue water has a type of salt/oil in it, the clear water is regular water. Because the blue water has the extra material, it’s “heavier” and thus “sinks” in the clear water, the figure is more sense than the clear water, but less dense than the blue water causing it to sink in the clear, but float on the blue. I believe it would be a type of ‘density toy’