> [*] lead and all other 'bad' substances originate from this planet. Unless
> there is a racket going on unnoticed by anyone, that smuggles lead,
> cadmium, mercury and other 'nasty' substances in from outer space, it's
> ALL NATURAL. Yes, people took some and roasted it with natural charcoal
> fires and moved it around a little. Yes, some of that is not so healthy,
> depending on where you put it, when, and for how long.

Natural certainly. But still hazardous.
As I'm sure you are well aware, lead is a very nasty substance indeed once
it gets concentrated in unnatural amounts. And compounds can in some
instances be worse than the pure substance if they increase volatility or
solubility. poisoning from lead paint used to be a very real hazard and even
now, people sanding down old houses can (and sometimes do) expose themselves
to life destroying quantities of lead. Elimination of lead from petrol seems
like having been a sensible step (high temperatures and fine particle
outputs don't help at all). I understand that heavy users of firearms are at
risk of lead poisoning. Quite where PCBs fit into this I don't know.



        Russell McMahon

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