This little experiment was more difficult than I expected. Next time I will try it during the day. The lack of light gave me the most trouble. Also, the colors that I used mixed into something that resembled the color of mud water. I tried different backgrounds. In the end, I edited in this lovely shade.
OIl and water are difficult, but definitely fun to play with! I'd suggest playing with a bold patterned paper. That seemed to me to yield the best results. Keep with it. I love this shade of purple! Well done!