Mixing fluids is important and difficult.
Today’s invention is a way to determine optically just how mixed eg a can of paint is (and might be applied to many other industrial processes).
Paint is mixed using a robotically-driven stirrer with an endoscope (or two) within it.
The stirrer can send information to a computer, with image processing capability, which can tell by colour contrast, what the state of mixing is locally.
If it’s well mixed then the endoscope would be automatically moved to a new location within the container.
This process would continue until the degree of local mixing at each 3D location, assessed by contrast, was within an acceptable tolerance. Multispectral contrast would allow machines to spot unmixed regions with greater precision than human eyes.