I really like this photo because its wicked technical and also good looking.

The bottle is a ordinary plastic bottle filled with clean water.

Before filling the bottle I drilled a hole in the bottom and glued a plastic test tube painted black.

Now, put a firecracker inside the black tube and detonate it. The black absorbs most of the light, the expanding gasses make a neat cloud and the pressure change in the bottle creates caviatation bubbles in the top section of the bottle.

Cool.

Cheers.

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