Yes I remember doing something similar in freshman chemistry to illustrate a liquid in liquid solution.I have a fuzzy memory of a Model Garage story in Popular Science wherein Gus Wilson confounds the town grump, Silas Barnstable, by mixing water and alcohol-based antifreeze, and getting less total volume than the sum of the parts.
It's obviously an old story, as "permanent" (ethylene glycol- based) antifreeze has been around for a long time.
Imagine his surprise had they demonstrated a liquid in solid solution. We did it with a mercury into silver solution but I doubt classes do that today.