Oil and alcohol, in a glass bottle, a tiny bit shaken, and placed in front of a tabasco for the colorful background. I tried shot after shot after shot and wasn't happy with any of them, so I cropped a small portion of one of the images to get this. Played a bit with levels and this is what I got.
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I do like the pattern of bubbles. The blurred background being so much brighter is very distracting -- I think it would have been better with more light on the foreground.