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Wrapping Chocolate
at Tue, 20 Apr 2004 06:45:27 GMT in >,
(Mark Thorson) wrote :
>Alex Rast wrote:
>
>> Actually, the very, very best coating would be iridium, which
>> is hideously expensive per oz but since you'd only need a few
>> microns thickness could probably be achieved practicably.
>
>I don't think you could make a foil wrapper
>out of a platinum-group metal. Those metals are
>all quite hard. What's wrong with gold,
>which is very ductle?
>
No, you'd coat the foil with a very, very thin layer of the Pt-group metal.
I agree that a solid iridium foil would be stiff and rather useless.
Gold is slightly more reactive - it does resist oxidation but it is
susceptible to some chemical attack - and in addition is extremely soft. If
you coated a foil wrapper with gold, it would wear off very quickly, or get
small holes. You could of course go with a solid gold wrapper, but then the
price of the wrapper itself would be appreciable compared to the contents -
probably considerably more.
--
Alex Rast
(remove d., .7, not, and .NOSPAM to reply)
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