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Thanks for the reply, Glenn. I googled on your idea about mercury balls and although it's not elemental mercury (hard ball rather than a liquid bead), it does seem that they may well consist of a mercury based mix of oxides. Seems to be a condensate of the mercury ionisation used to produce the...

Hi, The light in our UV filter stopped working so I changed the bulb (without touching it or allowing it to touch the sides of the crystal enclosure) but it the UV filter still did not light up. The old bulb doesn't look like it has exploded (although there is a small bead of metal rolling...