I never look forward to the water marble day of the 31 Day Challenge. This year, instead of putting myself through all of the pain, I went straight to a technique that I do have fun with: the spray marble! This technique is a sister to the water marble, and I actually prefer the edgy, tattered outcome.
I started out by using a triangle makeup sponge to do a gradient of cream, grey, and dark grey. Then, I painted on a coat of glow in the dark topcoat, because why not?
The spray marble began with filling a plastic cup with room temperature filtered water and taping off the area surrounding my fingers to minimize mess. I gently dropped one drop of black polish on the surface of the water, and then used a spray bottle to mist a 50/50 mixture of water and apple cider vinegar on the polish. I've seen other people use hairspray, perfume, all sorts of other mixtures to break up the polish on the water, but @madamluck was the first one I saw that used the vinegar mix. It worked great!
I dipped one finger in at a time, removed excess polish from the surface of the water, and pulled my finger out. Remove the tape, clean up, and topcoat; you're done!
The glow was stronger where it was layered over light polish. Looks kinda like alien eggs, doesn't it?