Milk is a fun medium, if not messy! I stayed up late last night experimenting. The color is from bakers food coloring. There are a few challenges. Milk and food coloring are fairly splashy and little tiny drops went further than I was expecting. I quickly learned to take measures to cover up all surfaces that would stain! I take one shot then spend more time cleaning up surfaces than taking photos. I end up turning on my flashes in between all the photos, because they have timed out before I am done cleaning up. The surface I'm dropping drops onto must be scrupulously clean, as any streaks, spots, or tiny fibers will show up in the pictures. I'd rather get it right the first time than get a great photo but have to spend a lot of time in Photoshop cleaning it up! Now a bottle of glass cleaner occupies some of my work space! I also have to be careful not to use cloths or paper towels with too many
I got a few surprises that were quite interesting. One drop with green food coloring flattened out; it looks like a flattened jesters hat to me. One milk drop that had pink food coloring, made a little heart shape, that was fun. Another is when I moved to trying double drops of milk: these created an effect I can only describe as "fractured." They have long tendrils of colored milk reaching out of the frame. I also thoroughly flush out all droppers and such, as dried milk in them would not be a good thing!!
There is always music in my studio, it keeps me awake and is fun to jam out to. It takes me probably a half hour or so to set up and just as long to clean up, so my photo shoots are 3-4 hours usually, sometimes I do an all day shoot though if I'm getting good results.