Hi,
TomR wrote:
However, this is, I think, the stupidest thing I have ever done in a darkroom.
When I was at school, two of us used a strobe in the school darkroom to shoot "pucks" as they collided on a sheet of plate glass. The pucks were painted white on top, so the long exposures under the strobe gave a series of dots, showing the tracks of the pucks before and after the collision.
To make the pucks glide over the plate glass, they were hollow underneath. In the hollow you put a lump of dry ice (solid carbon diodide) that turned to gas and made the puck float. Despite having a ventilation fan running, the teacher found us "asleep" about 45 minutes later. Luckily.
mike
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