I found out you can do this with mica powder and water. Yes its in a jam jar loooool. Next step - put in better jar and find out how to add RGB
I added like a pinch into this whole jar and i think its still too much. Its called rheoscopic fluid (or as close as you can get with sketchy aluminium oxide mica powder from china) and is supposed to show micro currents in water. Looks a lot cooler in person.

But how to add rgb...? This is the big question.