Purple Rain

Video of the week number three was going to be footage from a thunderstorm we had a few weeks ago, but blogger was playing up that day and wouldn't let me post the video. You can see the video here instead if you like. To be honest, though it was a very dramatic storm (two hours with at least one flash and bone-shaking peal of thunder every thirty seconds or so), it's pretty bog-standard cinematograohy, but I did apparently manage to catch a little discharge, as you can just about see on the left in this picture: Though I never ever noticed it until somebody commented on the video over at youtube. Here we are in the split second of a flash: And then a second later it's night again: If you didn't catch that that strike first time round, here we are again with a bit o'zooming: Pretty, but why is it purple?