Soap bubbles with coloured refraction from card underneath. I used liquid hand-soap in warm water.
Although these images are highly processed in Photoshop CS6 they are also the result of some considerable effort in photographing them. The set-up is quite involved and I had difficult getting the bubbles and refractions from the coloured card (underneath) right. Because the bubbles from the soap kept dissipating quickly I had to have a plastic tube in my mouth as I shot the other end was in the water dish, so I could 'blow bubbles' as I shot them.
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