Thanks Vx - that didn't tell me much other than there's a gel involved, so a bit of poking about lead me to all sorts of interesting things about redox reactions, what oxidation actually is, and that the Swedish "tung sten" literally means, apparently, "heavy stone".
That's my next dinner party conversation taken care of.
I also liked this snippet I found on my exploration. Not being a train traveller this was new to me.
"ICE 3 high speed trains use electrochromatic glass panels between the passenger compartment and the driver's cabin. The standard mode is clear, and can be switched by the driver to frosted/translucent, mainly to conceal "unwanted sights" from passengers' view, for example in the case of (human) obstacles."
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