One of my most interesting experiences in photography was exactly this experience. It is both a type of game, entertainment and art. This photography should be done in the aquarium, and you can pour all kinds of light and heavy inks with different concentrations into the water gently with a syringe or a dropper and record that photo at the same moment.
Ink in water
The shapes and designs that are created by chance are very beautiful and it is better to use a macro lens and high exposure speed in this type of photography. do me You can see some examples above