Soap Film 48
Colours and patterns arising from the interference of reflected light rays on a thin film of water and soap held in a tiny frame (a 'bubble wand'). The inner circle which I use for these photos measures 18mm but this shot, and two in the Comments, are just a tiny area within that circle.
Using some washing up liquid (Tesco's own brand!) with some water added - it's so tempting to try this out using different soaps! The colours are very slightly brightened - otherwise the soap film is completely natural.
Sony Alpha 100 SDLR camera with Cosina Macro 100mm lens; 1/125 sec at f/11 (ISO 200). No flash - lit by an office type angle-poised lamp.
Anyone interested in this type of photography, please feel free to join the Soap Films group (link below) and add some photos soon!