I have done a lot of experimenting with water drops and decided to see what milk looked like. All this was done by hand. One hand on an eyedropper mounted above a bowl and the other hand on the shutter button.
This one is orange milk into blue water
These are all pink milk into green water (was going for red into green)
This one is orange water into blue water
I think milk into milk definitely gives more substance.
I'm open for critique/suggestions.









